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Share-based Compensation - Award Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock Units (RSUs)      
Restricted Stock Awards, Shares Activity      
Outstanding at the beginning of the period (in shares) 406,575 360,988 228,867
Granted (in shares) 638,138 60,181 67,130
Acquired in the Merger (in shares) 879,779    
Forfeited/cancelled (in shares) (26,347) (10,411)  
Vested (in shares) (186,330) (26,609)  
Outstanding at the end of the period (in shares) 1,511,820 406,575 360,988
Restricted Stock Awards, Weighted-average Grant Date Fair Value      
Outstanding at the beginning of the period (in dollars per share) $ 17.33 $ 15.17 $ 12.86
Granted (in usd per share) 41.99 43.78 37.72
Acquired in the Merger (in usd per share) 47.36    
Forfeited/canceled (in usd per share) 43.43 28.59  
Vested (in usd per share) 38.11 28.81  
Outstanding at the end of the period (in dollars per share) $ 44.49 $ 17.33 $ 15.17
Converted in the Merger (in shares) 55,022    
Weighted-average grant date fair value (in usd per unit) $ 42.06    
Restricted Stock Awards (RSAs)      
Restricted Stock Awards, Shares Activity      
Outstanding at the beginning of the period (in shares) 2,289,446 2,639,663 3,536,175
Granted (in shares) 269,915 387,909 296,404
Forfeited/cancelled (in shares) (136,489) (119,366) (293,174)
Vested (in shares) (408,353) (446,447) (458,772)
Outstanding at the end of the period (in shares) 888,305 2,289,446 2,639,663
Restricted Stock Awards, Weighted-average Grant Date Fair Value      
Outstanding at the beginning of the period (in dollars per share) $ 16.70 $ 13.65 $ 12.81
Granted (in usd per share) 40.82 42.61 32.42
Forfeited/canceled (in usd per share) 34.18 29.77 22.39
Vested (in usd per share) 34.37 24.09 26.86
Outstanding at the end of the period (in dollars per share) $ 40.67 $ 16.70 $ 13.65
Non-Vested Stock Options Outstanding      
Non-Vested Stock Options Outstanding, Shares Activity      
Beginning balance (in shares) 0 0 0
Acquired in the Merger (in shares) 127,906    
Exercised (in shares) 0 0 0
Forfeited/canceled (in shares) (5,953)    
Expired (in shares) 0    
Vested (in shares) 1,144    
Ending balance (in shares) 120,809 0 0
Non-Vested Stock Options Outstanding, Weighted-average Grant Date Fair Value      
Beginning balance (in usd per share) $ 0 $ 0 $ 0
Acquired in the Merger (in usd per share) 39.38    
Exercised (in dollars per share) 0 0 0
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) $ 39.63 $ 0 $ 0
Stock Options Outstanding, Shares Activity      
Vested (in shares) 1,144    
Stock Options Outstanding, Weighted-average Grant Date Fair Value      
Acquired in the Merger (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    
Vesting term 5 years    
Stock Options Outstanding      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Non-Vested Stock Options Outstanding, Shares Activity      
Exercised (in shares) (25,602) (185,964) (19,308)
Vested (in shares) 1,144    
Non-Vested Stock Options Outstanding, Weighted-average Grant Date Fair Value      
Acquired in the Merger (in usd per share) $ 29.48    
Exercised (in dollars per share) 30.10 $ 31.00 $ 31.00
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) 0 366,000 404,000
Acquired in the Merger (in shares) 520,379    
Forfeited/canceled (in shares) 0    
Expired (in shares) (756)    
Vested (in shares) 1,144    
Ending balance (in shares) 495,165 0 366,000
Stock Options Outstanding, Weighted-average Grant Date Fair Value      
Beginning balance (in usd per share) $ 0 $ 15.75 $ 15.75
Acquired in the Merger (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) $ 29.48 $ 0 $ 15.75
Exercisable/vested (in shares) 495,165    
Exercisable/vested (in usd per share) $ 29.48    
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) 206,580 183,419 116,289
Outstanding at the end of the period (in shares)   206,580 183,419
Restricted Stock Awards, Weighted-average Grant Date Fair Value      
Outstanding at the beginning of the period (in dollars per share) $ 34.11 $ 29.86 $ 25.31
Outstanding at the end of the period (in dollars per share)   $ 34.11 $ 29.86
Adjusted for Conversion | Restricted Stock Awards (RSAs)      
Restricted Stock Awards, Shares Activity      
Outstanding at the beginning of the period (in shares) 1,163,232 1,341,136 1,796,678
Outstanding at the end of the period (in shares)   1,163,232 1,341,136
Restricted Stock Awards, Weighted-average Grant Date Fair Value      
Outstanding at the beginning of the period (in dollars per share) $ 32.87 $ 26.86 $ 25.21
Outstanding at the end of the period (in dollars per share)   $ 32.87 $ 26.86
Adjusted for Conversion | Non-Vested Stock Options Outstanding      
Non-Vested Stock Options Outstanding, Shares Activity      
Beginning balance (in shares)     0
Non-Vested Stock Options Outstanding, Weighted-average Grant Date Fair Value      
Beginning balance (in usd per share)     $ 0
Adjusted for Conversion | Stock Options Outstanding      
Stock Options Outstanding, Shares Activity      
Beginning balance (in shares)   185,964 205,272
Ending balance (in shares)     185,964
Stock Options Outstanding, Weighted-average Grant Date Fair Value      
Beginning balance (in usd per share)   $ 31.00 $ 31.00
Ending balance (in usd per share)     $ 31.00