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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Shares Purchased to Fund Options Exercised [Member]
Retained Earnings [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]
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance at Dec. 31, 2016         $ 315 $ 214,462 $ 361,192 $ (53,754) $ (8,362) $ 513,853
Net Income             12,260     12,260
Award of common shares released from Employee Benefit Trust           2,280       2,280
Vesting of restricted stock unit awards           (4,536) (262) 4,798  
Stock-based compensation expense           3,295       3,295
Purchase of treasury shares     $ (2,268) $ (2,268)            
Dividends on common stock             (5,246)     (5,246)
Other comprehensive loss                 1,228 1,228
Balance at Mar. 31, 2017         315 215,501 367,944 (51,224) (7,134) 525,402
Balance at Dec. 31, 2017         315 217,906 381,048 (57,675) (8,986) 532,608
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from Accumulated Other Comprehensive Income (Loss) to Retained Earnings         2,073 (2,073)
Impact of adoption of Accounting Standard Update 2016-01         (775) 775
Net Income             11,412     11,412
Award of common shares released from Employee Benefit Trust           2,488       2,488
Vesting of restricted stock unit awards           (4,731) (170) 4,901  
Stock-based compensation expense           3,452       3,452
Purchase of treasury shares $ (5,913) $ (5,913) $ (2,050) $ (2,050)            
Dividends on common stock             (5,795)     (5,795)
Other comprehensive loss         (895) (895)
Balance at Mar. 31, 2018         $ 315 $ 219,115 $ 387,793 $ (60,737) $ (11,179) $ 535,307