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Stock Based Compensation - Award Activity (Details)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Restricted Stock Units (RSUs)  
Restricted Stock Awards, Shares Activity  
Outstanding at the beginning of the period (in shares) | shares 406,575
Granted (in shares) | shares 533,267
Converted in the Merger (in shares) | shares 55,022
Acquired in the Merger (in shares) | shares 824,757
Forfeited/cancelled (in shares) | shares (20,648)
Vested (in shares) | shares (104,652)
Outstanding at the end of the period (in shares) | shares 1,494,326
Restricted Stock Awards, Weighted-average Grant Date Fair Value  
Outstanding at the beginning of the period (in dollars per share) $ 17.33
Granted (in usd per share) 41.51
Converted in the Merger (in usd per share) 42.06
Acquired in the Merger (in usd per share) 47.71
Forfeited/canceled (in usd per share) 41.64
Vested (in usd per share) 28.85
Outstanding at the end of the period (in dollars per share) $ 38.46
Restricted Stock Awards (RSAs)  
Restricted Stock Awards, Shares Activity  
Outstanding at the beginning of the period (in shares) | shares 2,289,446
Granted (in shares) | shares 269,915
Forfeited/cancelled (in shares) | shares (135,760)
Vested (in shares) | shares (368,291)
Outstanding at the end of the period (in shares) | shares 929,096
Restricted Stock Awards, Weighted-average Grant Date Fair Value  
Outstanding at the beginning of the period (in dollars per share) $ 16.70
Granted (in usd per share) 40.82
Forfeited/canceled (in usd per share) 34.15
Vested (in usd per share) 31.07
Outstanding at the end of the period (in dollars per share) $ 40.47
Non-Vested Stock Options Outstanding  
Non-Vested Stock Options Outstanding, Shares Activity  
Beginning balance (in shares) | shares 0
Acquired (in shares) | shares 127,906
Forfeited/canceled (in shares) | shares (3,094)
Expired (in shares) | shares 0
Vested (in shares) | shares (1,144)
Ending balance (in shares) | shares 123,668
Non-Vested Stock Options Outstanding, Weighted-average Grant Date Fair Value  
Beginning balance (in usd per share) $ 0
Acquired (in usd per share) 39.38
Forfeited/canceled (in usd per share) 32.81
Expired (in usd per share) 0
Vested (in usd per share) 46.95
Ending balance (in usd per share) $ 39.47
Stock Options Outstanding, Shares Activity  
Vested (in shares) | shares 1,144
Stock Options Outstanding, Weighted-average Grant Date Fair Value  
Acquired (in usd per share) $ 39.38
Forfeited/canceled (in usd per share) 32.81
Expired (in usd per share) 0
Vested (in usd per share) $ 46.95
Stock Options Outstanding  
Non-Vested Stock Options Outstanding, Shares Activity  
Vested (in shares) | shares (1,144)
Non-Vested Stock Options Outstanding, Weighted-average Grant Date Fair Value  
Acquired (in usd per share) $ 29.48
Forfeited/canceled (in usd per share) 0
Expired (in usd per share) 32.81
Vested (in usd per share) $ 46.95
Stock Options Outstanding, Shares Activity  
Beginning balance (in shares) | shares 0
Acquired (in shares) | shares 520,379
Forfeited/canceled (in shares) | shares 0
Expired (in shares) | shares (756)
Vested (in shares) | shares 1,144
Ending balance (in shares) | shares 520,767
Stock Options Outstanding, Weighted-average Grant Date Fair Value  
Beginning balance (in usd per share) $ 0
Acquired (in usd per share) 29.48
Forfeited/canceled (in usd per share) 0
Expired (in usd per share) 32.81
Vested (in usd per share) 46.95
Ending balance (in usd per share) $ 29.51
Exercisable/vested (in shares) | shares 520,767
Exercisable/vested (in usd per share) $ 29.51
Stock Options  
Stock Options Outstanding, Weighted-average Grant Date Fair Value  
Expiration term 10 years
Vesting term 5 years
Adjusted for Conversion | Restricted Stock Units (RSUs)  
Restricted Stock Awards, Shares Activity  
Outstanding at the beginning of the period (in shares) | shares 206,580
Restricted Stock Awards, Weighted-average Grant Date Fair Value  
Outstanding at the beginning of the period (in dollars per share) $ 34.11
Adjusted for Conversion | Restricted Stock Awards (RSAs)  
Restricted Stock Awards, Shares Activity  
Outstanding at the beginning of the period (in shares) | shares 1,163,232
Restricted Stock Awards, Weighted-average Grant Date Fair Value  
Outstanding at the beginning of the period (in dollars per share) $ 32.87