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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2012 $ 95,032 $ 23,563 $ 15,531 $ 123,442 $ (37,884) $ (29,620)
Net income 111,272 $ 111,272
Other comprehensive income, net of deferred taxes 10,241 $ 10,241
Dividends paid (41,079) $ (41,079)
Stock-based compensation 5,288 $ 5,288
Exercise of stock options and vesting of RSU's (2,423) (2,423)
Tax benefit realized from exercise of stock options and vesting of RSU's $ 2,302 2,302
Common stock issued - compensation plans $ 84 $ (84)
Unpaid dividends accrued $ (1,547) $ (1,547)
Balance at Dec. 31, 2013 179,086 $ 23,647 $ 20,614 192,088 $ (37,884) $ (19,379)
Net income 38,628 $ 38,628
Other comprehensive income, net of deferred taxes 19,379 $ 19,379
Dividends paid (31,446) $ (31,446)  
Stock-based compensation 5,647 $ 5,647
Exercise of stock options and vesting of RSU's (2,340) (2,340)
Tax benefit realized from exercise of stock options and vesting of RSU's $ 2,302 1,621
Common stock issued - compensation plans $ 70 $ (70)
Unpaid dividends accrued $ (1,111) $ (1,111)
Repurchase of shares of common stock (24,002) $ (24,002)
Balance at Dec. 31, 2014 185,462 $ 23,717 $ 25,472 $ 198,159 $ (61,886)
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 $ 227,738 $ 23,776 $ 29,591 $ 239,098 $ (64,727)