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Options and Awards - Options Outstanding Rollforward (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Options Outstanding(1)        
Balance at beginning of period, (in shares) 4,188 4,739 5,176  
Granted (in shares) 776 640 481  
Forfeited (in shares) (63) (120) (178)  
Exercised (in shares) (809) (1,071) (740)  
Balance at end of period, (in shares) 4,428 4,188 4,739  
Weighted Average Exercise Price(3)        
Balance at beginning of period, (in dollars per share) $ 14.71 $ 11.09 $ 9.85  
Granted (in dollars per share) 44.31 29.27 17.21  
Forfeited (in dollars per share) 26.84 15.86 4.93  
Exercised (in dollars per share) 8.83 7.26 5.87  
Balance at end of period, (in dollars per share) 20.85 14.71 11.09  
Weighted Average Exercise Price of Options Vested (in dollars per share) $ 12.82 $ 10.48 $ 8.53 $ 6.93
Number of Options Vested (in shares) 2,557 2,431 2,776 2,704
Share-based Compensation Arrangement by Share-based Payment Award, Options, Adjustments In Period 336