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Statement - Consolidated Statements of Changes in Stockholders’ Equity (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952159 - Statement - Consolidated Statements of Cash Flows (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Nature of Operations link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Recent Accounting Pronouncements link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Disposition link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Contract Revenues link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 9952167 - 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Disclosure - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Accumulated Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Earnings Per Common Share - Net Income, Weighted Average Common Shares Used in Calculating Basic Earnings Per Common Share and Diluted EPS (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Earnings Per Common Share - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Retirement and Other Employee Benefits - Components of Net Periodic Benefit Cost (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Retirement and Other Employee Benefits - 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