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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Shares Purchased to Fund Options Exercised [Member]
Common Stock [Member]
Shares Purchased to Fund Options Exercised [Member]
Additional Paid-in Capital [Member]
Shares Purchased to Fund Options Exercised [Member]
Retained Earnings [Member]
Shares Purchased to Fund Options Exercised [Member]
Treasury Stock [Member]
Shares Purchased to Fund Options Exercised [Member]
AOCI Attributable to Parent [Member]
Shares Purchased to Fund Options Exercised [Member]
Restricted Stock Awards Repurchased to Satisfy Tax Obligations [Member]
Retained Earnings [Member]
Restricted Stock Awards Repurchased to Satisfy Tax Obligations [Member]
Treasury Stock [Member]
Restricted Stock Awards Repurchased to Satisfy Tax Obligations [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Total
Exercise of stock options                   $ 2 $ (34) $ 159 $ 127
Stock-based compensation expense                     3,673       3,673
Stock-based income tax benefit                     421       421
Purchase of treasury shares $ (7,492) $ (7,492) $ (1,593) $ (1,593)            
Dividends on common stock                       (9,878)   (9,878)
Other comprehensive income                   8,650 8,650
Balance at Jun. 30, 2016                   315 212,613 346,218 (53,351) 3,088 508,883
Balance at Dec. 31, 2015                   315 210,652 316,530 (48,868) (5,562) 473,067
Net Income                       39,996   39,996
Award of common shares released from Employee Benefit Trust                   1,912 1,912
Vesting of restricted stock unit awards                     (4,047) (396) 4,443  
Other comprehensive income                           1,777 1,777
Balance at Jun. 30, 2016                   315 212,613 346,218 (53,351) 3,088 508,883
Balance at Mar. 31, 2016                           1,311  
Net Income                             30,435
Exercise of stock options                     (6) (40) 46  
Stock-based compensation expense                     4,190       4,190
Purchase of treasury shares     $ (278)   $ (278) $ (2,321) $ (2,321)            
Dividends on common stock                       (10,487)   (10,487)
Other comprehensive income                           1,786 1,786
Balance at Jun. 30, 2017                   315 216,447 375,388 (51,483) (6,576) 534,091
Balance at Dec. 31, 2016                   315 214,462 361,192 (53,754) (8,362) 513,853
Net Income                       24,985   24,985
Award of common shares released from Employee Benefit Trust                     2,363       2,363
Vesting of restricted stock unit awards                     (4,562) (262) 4,824  
Other comprehensive income                           558 558
Balance at Jun. 30, 2017                   $ 315 $ 216,447 $ 375,388 $ (51,483) (6,576) 534,091
Balance at Mar. 31, 2017                           $ (7,134)  
Net Income                             $ 12,725