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Stock Incentive Plan (Performance Award Transactions) (Details) - Performance Shares
12 Months Ended
Dec. 31, 2016
shares
Share Activity  
Shares awarded but not earned at January 1 (in shares) 1,449,396
Shares awarded (in shares) 1,351,350
Shares forfeited or unearned (in shares) (818,626)
Shares earned (in shares) 0
Shares awarded but not earned at December 31 (in shares) 1,982,120