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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2014 $ 23,717 $ 25,472 $ 198,159 $ (61,886) $ 185,462
Net income     62,126   62,126
Dividends paid     (20,569)   (20,569)
Stock-based compensation   4,530     4,530
Exercise of stock options and vesting of RSU's   (788)     (788)
Tax benefit realized from exercise of stock options and vesting of RSU's   436     436
Common stock issued - compensation plans 59 (59)    
Unpaid dividends accrued     (618)   (618)
Repurchase of shares of common stock       (2,841) (2,841)
Balance at Dec. 31, 2015 23,776 29,591 239,098 (64,727) 227,738
Net income     87,472   87,472
Dividends paid     (32,815)   (32,815)
Stock-based compensation   3,054     3,054
Exercise of stock options and vesting of RSU's   (14,002)     (14,002)
Tax benefit realized from exercise of stock options and vesting of RSU's   8,826     8,826
Common stock issued - compensation plans 258 (258)    
Unpaid dividends accrued     (355)   (355)
Repurchase of shares of common stock       (14,018) (14,018)
Balance at Dec. 31, 2016 24,034 27,211 293,400 (78,745) 265,900
Net income     52,142   52,142
Dividends paid     (23,905)   (23,905)
Stock-based compensation   3,659     3,659
Exercise of stock options and vesting of RSU's   (2,483)     (2,483)
Common stock issued - compensation plans 58 (58)    
Unpaid dividends accrued     (314)   (314)
Repurchase of shares of common stock       (64,850) (64,850)
Balance at Dec. 31, 2017 $ 24,092 $ 28,329 $ 321,323 $ (143,595) $ 230,149