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Stockholders' Equity and Equity Compensation - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Oct. 31, 2016
Stockholders' Equity and Equity Compensation (Details) [Line Items]            
Share repurchase program, authorized amount           $ 40,000,000
Options outstanding (in shares)   170,253   170,253    
Weighted average exercise price (in dollars per share)   $ 21.99   $ 21.99    
Closing stock price (in dollars per share)   $ 21.88 $ 19.51 $ 21.88 $ 19.51  
Stock options awarded during period (in shares)       0 0  
Stock Awards            
Stockholders' Equity and Equity Compensation (Details) [Line Items]            
Share based compensation expense   $ 2,600,000 $ 2,400,000 $ 5,600,000 $ 4,700,000  
Unrecognized share based compensation expense   17,000,000   $ 17,000,000    
Weighted average recognition period       2 years 25 days    
Deferred Stock Units            
Stockholders' Equity and Equity Compensation (Details) [Line Items]            
Share based compensation expense   900,000 $ 900,000 $ 1,000,000 900,000  
Stock Options            
Stockholders' Equity and Equity Compensation (Details) [Line Items]            
Share based compensation expense       0 $ 0  
Unrecognized pre-tax expense related to stock option grants   $ 0   $ 0    
Stock Options | Minimum            
Stockholders' Equity and Equity Compensation (Details) [Line Items]            
Award vesting period       7 years    
Stock Options | Maximum            
Stockholders' Equity and Equity Compensation (Details) [Line Items]            
Award vesting period       10 years    
2016 Employee Plan            
Stockholders' Equity and Equity Compensation (Details) [Line Items]            
Number of additional shares of common stock authorized (in shares) 1,000,000          
Number of shares available for issuance (in shares)   1,304,901   1,304,901    
2016 Director Plan            
Stockholders' Equity and Equity Compensation (Details) [Line Items]            
Number of shares available for issuance (in shares)   121,481   121,481    
Equity Compensation Programs            
Stockholders' Equity and Equity Compensation (Details) [Line Items]            
Share repurchase program, authorized amount   $ 10,000,000   $ 10,000,000    
Stock repurchased during period (in shares)       97,315.000 54,290  
Stock repurchased during period, value       $ 2,200,000 $ 1,100,000  
Shares repurchased, average price per share (in dollars per share)       $ 22.33 $ 19.62  
Open Market Repurchase Program            
Stockholders' Equity and Equity Compensation (Details) [Line Items]            
Stock repurchased during period (in shares)       868,222 1,310,959  
Stock repurchased during period, value       $ 18,800,000 $ 24,100,000  
Shares repurchased, average price per share (in dollars per share)       $ 21.72 $ 18.41