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Share-based Compensation - Restricted Stock and RSU's Rollforward (Details) - Restricted stock and RSU's - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Shares      
Unvested at beginning of year (shares) 270    
Granted (shares) 90    
Forfeited (shares) (20)    
Vested (shares) (120)    
Unvested at end of year (shares) 220 270  
Weighted-Average Grant-Date Fair Value      
Unvested at beginning or year (usd per share) $ 41.01    
Granted (usd per share) 67.64 $ 51.99 $ 37.14
Forfeited (usd per share) 61.42    
Vested (usd per share) 30.05    
Unvested at end or year (usd per share) $ 55.46 $ 41.01