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Share-Based Compensation - Performance Restricted Stock Units Activity (Details) - PRSUs - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Outstanding at beginning of period: (in shares) 277 278 290  
Granted (in shares) 190 129 128  
Performance condition adjustments, net (in shares) (106) (50) (68)  
Released (in shares) (101) (68) (72)  
Forfeited (in shares) 0 (12) 0  
Outstanding at end of period: (in shares) 260 277 278  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Outstanding at beginning of period: (in dollars per share) $ 16.77 $ 17.80 $ 17.00 $ 16.01
Granted (in dollars per share) 13.63 19.46 20.42  
Performance condition adjustments, net (in dollars per share) 13.77 19.48 20.55  
Released (in dollars per share) 17.19 16.03 15.82  
Forfeited (in dollars per share) 0 16.16 0  
Outstanding at end of period: (in dollars per share) $ 16.77 $ 17.80 $ 17.00 $ 16.01