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Options and Awards - Options Outstanding Rollforward (Details) - $ / shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Number of Options Outstanding          
Balance at beginning of period, (in shares)     4,188    
Granted (in shares) 154 101 553 496  
Forfeited (in shares)     (46)    
Exercised (in shares)     (687)    
Balance at end of period, (in shares) 4,008   4,008    
Weighted Average Exercise Price          
Balance at beginning of period, (in dollars per share)     $ 17.35    
Granted (in dollars per share)     53.05 $ 33.61  
Forfeited (in dollars per share)     31.26    
Exercised (in dollars per share)     10.74    
Balance at end of period, (in dollars per share) $ 23.24   23.24    
Weighted Average Exercise Price of Options Vested (in dollars per share) $ 14.52   $ 14.52   $ 12.37
Number of Options Vested (in shares) 2,364   2,364   2,431