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Stock Incentive Plan Stock Incentive Plan (Performance Awards Earned and Issued) (Details) - Performance Shares - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Share-based compensation arrangements by share-based payment award, performance shares earned and issued [Line Items]    
Shares earned 0 286,804
Shares withheld for taxes on the earned awards   113,334
Shares issued subsequent to year-end 0 173,470