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Stock Incentive Plans - 2016 Equity Compensation Plan Restricted Stock Units Award Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 07, 2016
Dec. 31, 2020
Dec. 31, 2019
Aggregate fair value (in millions)      
Annual installment amount 100.00%    
Restricted Stock | 2016 Equity Compensation Plan      
Restricted shares      
Beginning balance (in shares)   222,786 173,209
Issued (in shares)   107,930 118,484
Vested (in shares)   (65,981) (41,859)
Forfeitures and cancellations (in shares)   (46,722) (27,048)
Ending balance (in shares)   218,013 222,786
Weighted Average Fair value on grant date      
Beginning balance (in dollars per share)   $ 32.63 $ 33.60
Issued, price on grant date (in dollars per share)   22.12 32.27
Vested during period (in dollars per share)   32.63 34.44
Forfeitures and cancellations (in dollars per share)   32.63 34,370,000
Ending balance (in dollars per share)   $ 27.48 $ 32.63
Aggregate fair value (in millions)      
Beginning balance, aggregate fair value   $ 7,270 $ 5,820
Issued, aggregate fair value   2,390 3,820
Vested, aggregate fair value   (2,150) (1,440)
Forfeitures and cancellations, aggregate fair value   (1,520) (930)
Ending balance, aggregate fair value   $ 5,990 $ 7,270
Term   3 years  
Restricted Stock | 2016 Equity Compensation Plan | Vesting Year 1      
Aggregate fair value (in millions)      
Annual installment amount   33.00%  
Restricted Stock | 2016 Equity Compensation Plan | Vesting Year 2      
Aggregate fair value (in millions)      
Annual installment amount   33.00%  
Restricted Stock | 2016 Equity Compensation Plan | Vesting Year 3      
Aggregate fair value (in millions)      
Annual installment amount   33.00%