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Stock-Based Compensation - Nonvested restricted stock (Details) - Restricted Stock - $ / shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Number of shares (thousands)        
Nonvested beginning balance (in shares) 1,887 1,955 1,664 1,664
Granted (in shares) 9 31 766  
Vested (in shares) (9) (75) (466)  
Forfeited (in shares) (33) (24) (9)  
Nonvested ending Balance (in shares) 1,854 1,887 1,955 1,854
Weighted average grant date fair value        
Nonvested weighted average exercise price beginning balance (in dollar per share) $ 39.65 $ 39.87 $ 44.26 $ 44.26
Granted the weighted average exercise price (in dollar per share) 37.77 29.67 34.05  
Vested weighted average exercise price (in dollar per share) 38.68 41.19 46.00  
Forfeited weighted average exercise price (in dollar per share) 39.80 40.49 42.23  
Nonvested weighted average exercise price ending balance (in dollar per share) $ 39.64 $ 39.65 $ 39.87 $ 39.64