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Equity Incentive Plans - Restricted Stock and Performance Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted - Average Fair Value      
Compensation expense $ 10,975 $ 18,563 $ 15,285
Company Officers and Employees | RSU | Minimum      
Equity Incentive Plans      
Vesting period 1 year    
Company Officers and Employees | RSU | Maximum      
Equity Incentive Plans      
Vesting period 3 years    
Company Officers and Employees | PSU      
Equity Incentive Plans      
Vesting period 3 years    
Company Officers and Employees | PSU | Minimum      
Equity Incentive Plans      
Awards earned as percentage of specified compensation 0.00%    
Company Officers and Employees | PSU | Maximum      
Equity Incentive Plans      
Awards earned as percentage of specified compensation 200.00%    
Omnibus Incentive 2015 Plan      
Equity Incentive Plans      
Share reserved for issuance (in shares) 6,664,012    
Shares remaining available for future grants (in shares) 5,060,479    
Omnibus Incentive 2015 Plan | RSU      
Number of Units      
Outstanding at beginning of the period (in shares) 881,832 874,942  
Granted (in shares) 655,522 473,724  
Vested (in shares) (567,836) (466,834)  
Forfeited (in shares) (22,275) 0  
Outstanding at end of the period (in shares) 947,243 881,832 874,942
Weighted - Average Fair Value      
Outstanding at beginning of the period (in dollars per share) $ 21.75 $ 20.15  
Granted (in dollars per share) 23.51 23.49  
Vested (in dollars per share) 20.81 20.52  
Forfeited (in dollars per share) 23.92 0  
Outstanding at end of the period (in dollars per share) $ 23.49 $ 21.75 $ 20.15
Shares of common stock that were not delivered (in shares) 161,165 63,490  
Vested (in shares) $ 12,900 $ 10,000  
Compensation expense 9,140 $ 12,353 $ 9,318
Unrecognized compensation expense $ 13,400    
Weighted average period 1 year 8 months 12 days    
Omnibus Incentive 2015 Plan | PSU      
Number of Units      
Outstanding at beginning of the period (in shares) 0 1,185,912  
Granted (in shares) 207,077 0  
Vested (in shares) 0 (900,226)  
Forfeited (in shares) 0 (285,686)  
Outstanding at end of the period (in shares) 207,077 0 1,185,912
Weighted - Average Fair Value      
Outstanding at beginning of the period (in dollars per share) $ 0 $ 20.29  
Granted (in dollars per share) 23.47 0  
Vested (in dollars per share) 0 20.29  
Forfeited (in dollars per share) 0 20.29  
Outstanding at end of the period (in dollars per share) $ 23.47 $ 0 $ 20.29
Shares of common stock that were not delivered (in shares) 0 900,226  
Vested (in shares)   $ 19,000  
Compensation expense $ 1,507 $ 6,210 $ 5,967
Unrecognized compensation expense $ 3,400    
Weighted average period 2 years