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Stock-Based Compensation (Stock Units Rollforward) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
RSUs      
Stock Units [Roll Forward]      
Outstanding at December 31, 2014 2,430,683    
Granted 668,619 881,554 791,349
Vested and distributed (1,004,964)    
Vested and deferred distributed (26,585)    
Forfeited (60,636)    
Outstanding at December 31, 2015 2,007,117 2,430,683  
Vested and deferred RSUs related to deferred compensation for non-employee directors [1] 228,883    
Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding at December 31, 2014, Weighted Average Grant Date Fair Value $ 8.02    
Granted, Weighted Average Grant Date Fair Value 7.58 $ 6.12 $ 7.14
Vested and Distributed, Weighted Average Grant Date Fair Value 9.62    
Vested and deferred distributed 8.14    
Forfeited, Weighted Average Grant Date Fair Value 6.79    
Outstanding at December 31, 2015, Weighted Average Grant Date Fair Value 7.11 $ 8.02  
Weighted Average Grant Date Fair Value of Vested and Deferred RSUs $ 7.93    
PSUs      
Stock Units [Roll Forward]      
Outstanding at December 31, 2014 2,837,162    
Granted 1,017,702 1,316,867 1,174,465
Vested and distributed (697,172) (496,926) (419,205)
Forfeited (45,143)    
Other - decrease due to performance of PSU's 85,186    
Outstanding at December 31, 2015 3,197,735 2,837,162  
Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding at December 31, 2014, Weighted Average Grant Date Fair Value $ 7.05    
Granted, Weighted Average Grant Date Fair Value 7.52 $ 6.14 $ 7.59
Vested and Distributed, Weighted Average Grant Date Fair Value 7.75    
Forfeited, Weighted Average Grant Date Fair Value 6.63    
Other decrease due to performance of PSU's, Weighted Average Grant Date Fair Value 7.81    
Outstanding at December 31, 2015, Weighted Average Grant Date Fair Value $ 7.07 $ 7.05  
[1] Included in outstanding at December 31, 2015. Vested and distribution deferred RSUs are primarily related to deferred compensation for non-employee directors.