99900 - Disclosure - Standard And Custom Axis Domain Defaults link:presentationLink link:calculationLink link:definitionLink 995200100 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 995200200 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) link:presentationLink link:calculationLink link:definitionLink 995200300 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 99940105 - Disclosure - Description of the business: - Basic and diluted net income per common share (Details) link:presentationLink link:calculationLink link:definitionLink 99940108 - Disclosure - Description of the business: - Leases (Details) link:presentationLink link:calculationLink link:definitionLink 40112 - Disclosure - Description of the business: - Leases (Details) (Calc2) link:presentationLink link:calculationLink link:definitionLink 99940501 - Disclosure - Income taxes: - Components of income (loss) before income taxes (Details) link:presentationLink link:calculationLink link:definitionLink 995200105 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 995200205 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00205 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) Default link:presentationLink link:calculationLink link:definitionLink 995200305 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 99940101 - Disclosure - Description of the business: (Details) link:presentationLink link:calculationLink link:definitionLink 99940102 - Disclosure - Description of the business: - Financial instruments (Details) link:presentationLink link:calculationLink link:definitionLink 99940103 - Disclosure - Description of the business: - Restricted cash and interest rate swap agreement (Details) link:presentationLink link:calculationLink link:definitionLink 99940106 - Disclosure - Description of the business: - Stockholders' (Deficit) Equity (Details) link:presentationLink link:calculationLink link:definitionLink 99940107 - Disclosure - Description of the business: - Revenue recognition (Details) link:presentationLink link:calculationLink link:definitionLink 99940201 - Disclosure - Property and equipment: (Details) link:presentationLink link:calculationLink link:definitionLink 99940202 - Disclosure - Property and equipment: - Cogent Fiber data center assets (Details) link:presentationLink link:calculationLink link:definitionLink 99940301 - Disclosure - Long-term debt: (Details) link:presentationLink link:calculationLink link:definitionLink 40301 - Disclosure - Long-term debt: Default (Details) link:presentationLink link:calculationLink link:definitionLink 99940302 - Disclosure - Long-term debt: - Limitations under the Indentures (Details) link:presentationLink link:calculationLink link:definitionLink 99940401 - Disclosure - Commitments and contingencies: - Current and potential litigation (Details) link:presentationLink link:calculationLink link:definitionLink 99940601 - Disclosure - Common stock buyback program: (Details) link:presentationLink link:calculationLink link:definitionLink 99940701 - Disclosure - Dividends on common stock: (Details) link:presentationLink link:calculationLink link:definitionLink 99940801 - Disclosure - Related party transactions: (Details) link:presentationLink link:calculationLink link:definitionLink 99940901 - Disclosure - Geographic and segment information: (Details) link:presentationLink link:calculationLink link:definitionLink 99941001 - Disclosure - Subsequent events: (Details) link:presentationLink link:calculationLink link:definitionLink 995200090 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 995210101 - Disclosure - Description of the business: link:presentationLink link:calculationLink link:definitionLink 995210201 - Disclosure - Property and equipment: link:presentationLink link:calculationLink link:definitionLink 995210301 - Disclosure - Long-term debt: link:presentationLink link:calculationLink link:definitionLink 995210401 - Disclosure - Commitments and contingencies: link:presentationLink link:calculationLink link:definitionLink 995210501 - Disclosure - Income taxes: link:presentationLink link:calculationLink link:definitionLink 995210601 - Disclosure - Common stock buyback program: link:presentationLink link:calculationLink link:definitionLink 995210701 - Disclosure - Dividends on common stock: link:presentationLink link:calculationLink link:definitionLink 995210801 - Disclosure - Related party transactions: link:presentationLink link:calculationLink link:definitionLink 995210901 - Disclosure - Geographic and segment information: link:presentationLink link:calculationLink link:definitionLink 995211001 - Disclosure - Subsequent events: link:presentationLink link:calculationLink link:definitionLink 99920102 - Disclosure - Description of the business: (Policies) link:presentationLink link:calculationLink link:definitionLink 99930103 - Disclosure - Description of the business: (Tables) link:presentationLink link:calculationLink link:definitionLink 99930203 - Disclosure - Property and equipment: (Tables) link:presentationLink link:calculationLink link:definitionLink 99930503 - Disclosure - Income taxes: (Tables) link:presentationLink link:calculationLink link:definitionLink 99930903 - Disclosure - Geographic and segment information: (Tables) link:presentationLink link:calculationLink link:definitionLink 99940104 - Disclosure - Description of the business: - Gross receipts taxes, universal service fund and other surcharges (Details) link:presentationLink link:calculationLink link:definitionLink