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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 11, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 10, 2018
Numerator for Earnings per Share Basic and Diluted:            
Net income   $ 30,881 $ 22,721 $ 78,480 $ 63,674  
Less: Income allocated to participating shares   87 73 229 214  
Net Income Allocated to Shareholders   $ 30,794 $ 22,648 $ 78,251 $ 63,460  
Denominators for Earnings per Share:            
Weighted Average Shares Outstanding—Basic (in shares)   34,799,174 34,751,266 34,783,175 34,722,370  
Add: Potentially dilutive shares (in shares)   220,118 208,873 228,909 208,139  
Denominator for Treasury Stock Method—Diluted (in shares)   35,019,292 34,960,139 35,012,084 34,930,509  
Weighted Average Shares Outstanding—Basic (in shares)   34,799,174 34,751,266 34,783,175 34,722,370  
Add: Average participating shares outstanding (in shares)   98,579 111,821 101,808 116,969  
Denominator for Two-Class Method—Diluted (in shares)   34,897,753 34,863,087 34,884,983 34,839,339  
Earnings per share—basic (in dollars per share)   $ 0.89 $ 0.65 $ 2.26 $ 1.83  
Net Income Available to Shareholders   $ 30,881 $ 22,721 $ 78,480 $ 63,674  
Earnings per share—diluted (in dollars per share)   $ 0.88 $ 0.65 $ 2.24 $ 1.82  
Repurchase of warrant $ 7,700     $ 7,652 $ 0  
Number of shares of common stock that holder of warrants have right to purchase (in shares)           517,012
Anti-dilutive warrants—exercise price (in dollars per share)     $ 31.53   $ 31.53 $ 31.53
Warrants            
Denominators for Earnings per Share:            
Anti-dilutive excluded from potentially dilutive shares (in shares) [1]   285,915 443,575 351,166 452,188  
Restricted Stock            
Denominators for Earnings per Share:            
Anti-dilutive excluded from potentially dilutive shares (in shares)   113,451 92,577 113,390 95,707  
[1] We repurchased our outstanding warrant on September 11, 2018 for $7.7 million. Prior to the repurchase, the warrant provided the holder the right to 517,012 shares of common stock at a strike price of $31.53 per share via cashless exercise.