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Stock-Based Compensation (Stock Units Rollforward) (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
RSUs      
Stock Units [Roll Forward]      
Outstanding at December 31, 2016 1,910,669    
Granted 438,521 516,739 668,619
Vested and distributed (691,319)    
Vested and deferred distributed (38,042)    
Forfeited (85,771)    
Outstanding at December 31, 2017 1,534,058 1,910,669  
Vested and deferred RSUs related to deferred compensation for non-employee directors [1] 326,835    
Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding at December 31, 2016, Weighted Average Grant Date Fair Value $ 7.23    
Granted, Weighted Average Grant Date Fair Value 12.65 $ 8.05 $ 7.58
Vested and Distributed, Weighted Average Grant Date Fair Value 6.21    
Vested and Deferred, Distributed In Period Weighted Average Grant Date Fair Value 9.46    
Forfeited, Weighted Average Grant Date Fair Value 8.66    
Outstanding at December 31, 2017, Weighted Average Grant Date Fair Value 9.10 $ 7.23  
Weighted Average Grant Date Fair Value of Vested and Deferred RSUs $ 9.16    
PSUs      
Stock Units [Roll Forward]      
Outstanding at December 31, 2016 4,281,792    
Granted 706,732 1,013,242 1,017,702
Vested and distributed (1,502,327) (1,072,692) (697,172)
Forfeited (131,465)    
Other - increase due to performance of PSU's 176,580    
Outstanding at December 31, 2017 3,531,312 4,281,792  
Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding at December 31, 2016, Weighted Average Grant Date Fair Value $ 7.09    
Granted, Weighted Average Grant Date Fair Value 12.75 $ 7.65 $ 7.52
Vested and Distributed, Weighted Average Grant Date Fair Value 6.16    
Forfeited, Weighted Average Grant Date Fair Value 8.24    
Other decrease due to performance of PSU's, Weighted Average Grant Date Fair Value 11.72    
Outstanding at December 31, 2017, Weighted Average Grant Date Fair Value $ 8.82 $ 7.09  
[1] Included in outstanding at December 31, 2017. Vested and deferred RSUs are primarily related to deferred compensation for non-employee directors.