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Share-Based Employee Compensation - Roll-Forward of Activity for Performance Share Units (Details) - Performance shares - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Share units        
Nonvested number of Units, beginning balance 1,433      
Granted, number of units 307 462 420  
Vested, number of units (606)      
Forfeited, number of units (15)      
Nonvested, Number of Shares, Ending Balance 1,119      
Weighted Average Grant Date Fair Value        
Nonvested weighted Average Grant Date Fair Value, beginning balance (in dollars per unit) $ 9.05      
Granted, weighted average grant date fair value (in dollars per unit) 14.80 $ 10.68 $ 8.61  
Vested, weighted average grant date fair value (in dollars per units) 7.87      
Forfeited, weighted average grant date fair value (in dollars per unit) 10.68      
Nonvested weighted Average Grant Date Fair Value, ending balance (in dollars per unit) $ 11.10 $ 9.05    
Award requisite service period 3 years   1 year  
Shares at target award (in shares) 1,292      
Shares awarded as a percentage of granted       130.20%
Minimum        
Weighted Average Grant Date Fair Value        
Award requisite service period 1 year      
Target award shares percent 50.00%      
Shares awarded as a percentage of granted 0.00%      
Maximum        
Weighted Average Grant Date Fair Value        
Award requisite service period 3 years      
Target award shares percent 80.00%      
Shares awarded as a percentage of granted 200.00%