75000 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 995457 - Disclosure - Valuation Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 999009 - Disclosure - Anchoring link:presentationLink link:calculationLink link:definitionLink Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Dividends Or Dividend Equivalents Not Otherwise Included In Total Compensation [Member] Dividends Or Dividend Equivalents Not Otherwise Included In Total Compensation Member Amendment Flag Total Adjustments For Pension [Member] Total Adjustments For Pension Member Document Type Entity Central Index Key Adjustment For Grant Date Values In The Summary Compensation Table [Member] Adjustment For Grant Date Values In The Summary Compensation Table Member Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Performance Shares [Member] Insider Trading Policies and Procedures Adopted Minimum [Member] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Statistical Measurement [Domain] Document Period End Date Cover [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Name Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Restricted Share And R S Us [Member] Year End Fair Value Of Unvested Awards Granted In The Current Year [Member] Year End Fair Value Of Unvested Awards Granted In The Current Year Member Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Fair Value At End Of Prior Year For Awards Granted In Any Prior Fiscal Year That Fail To Meet The Applicable Vesting Conditions During Current Year [Member] Fair value at end of prior year for awards granted in any prior fiscal year that fail to meet the applicable vesting conditions during current year. Difference In Fair Values Between Prior Year End Fair Values And Vest Date Fair Values For Awards Granted In Prior Years [Member] Difference In Fair Values Between Prior Year End Fair Values And Vest Date Fair Values For Awards Granted In Prior Years Member Maximum [Member] Total Adjustments For Equity Awards [Member] Total Adjustments For Equity Awards Member Statistical Measurement [Axis] Entity Registrant Name Amendment Description Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Difference For Unvested Awards Granted In Prior Years [Member] Difference for unvested awards granted in prior years. Difference for unvested awards granted in prior years