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Share-Based Employee Compensation - Roll-Forward of Activity for Performance Share Units (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance shares      
Number of Share units      
Nonvested number of Units, beginning balance 1,119    
Granted, number of units 226 307 462
Target Award Adjustment, number of units 383    
Vested, number of units (774)    
Forfeited, number of units (52)    
Nonvested number of units, ending balance 1,051 1,119  
Weighted Average Grant Date Fair Value      
Nonvested weighted Average Grant Date Fair Value, beginning balance (in dollars per unit) $ 11.10    
Granted, weighted average grant date fair value (in dollars per unit) 15.17 $ 14.80 $ 10.68
Target Award Adjustment, weighted average grant date fair value (in dollars per unit) 8.61    
Vested, weighted average grant date fair value (in dollars per units) 8.66    
Forfeited, weighted average grant date fair value (in dollars per unit) 15.28    
Nonvested weighted Average Grant Date Fair Value, ending balance (in dollars per unit) $ 13.50 $ 11.10  
Award requisite service period 3 years   1 year
Performance Shares, including shares subject to total shareholder return [Member]      
Number of Share units      
Granted, number of units 375    
Weighted Average Grant Date Fair Value      
Granted, weighted average grant date fair value (in dollars per unit) $ 15.88    
Minimum | Performance shares      
Weighted Average Grant Date Fair Value      
Award requisite service period 1 year    
Target award shares percent 50.00%    
Maximum | Performance shares      
Weighted Average Grant Date Fair Value      
Award requisite service period 3 years    
Target award shares percent 80.00%