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Stock Incentive Plan (Performance Award Transactions) (Details) - Performance Shares - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share Activity    
Shares awarded but not earned at January 1 2,481,767  
Shares awarded 861,686  
Shares forfeited or unearned (1,894,057)  
Shares earned 0 (286,804)
Shares awarded but not earned at December 31 1,449,396 2,481,767