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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Beginning balance at Dec. 31, 2012 $ 53,896 $ 70 $ 913 $ 23 $ 52,890
Beginning balance, shares at Dec. 31, 2012   7,017      
Common stock issued on exercise of options, Shares   148      
Common stock issued on exercise of options 1,860 2 1,858 0 0
Share based compensation expense, net of tax, Shares   0      
Share based compensation expense, net of tax 602 0 602 0 0
Excess tax benefits from share-based compensation 2,083 0 2,083 0 0
Cash dividends on common stock (2,765) 0 0 0 (2,765)
Unrealized holding gains (losses) on marketable securities, net of tax (39) 0 0 (39)  
Net income 12,331 0 0 0 12,331
Ending balance at Sep. 30, 2013 67,968 72 5,456 (16) 62,456
Ending balance, shares at Sep. 30, 2013   7,165      
Beginning balance at Dec. 31, 2013 72,553 72 5,781 (26) 66,726
Beginning balance, shares at Dec. 31, 2013   7,165      
Common stock issued on exercise of options and vesting of restricted stock units, Shares   42      
Common stock issued on exercise of options and vesting of restricted stock units 238 0 238 0 0
Common stock repurchased on vesting of restricted stock units, Shares   (8)      
Common stock repurchased on vesting of restricted stock units (407) 0 (407) 0 0
Share based compensation expense, net of tax, Shares   0      
Share based compensation expense, net of tax 1,186 0 1,186 0 0
Excess tax benefits from share-based compensation 457 0 457 0 0
Company repurchase of common stock (1,650) 0 (1,650) 0 0
Company repurchase of common stock, shares   (36)      
Cash dividends on common stock (3,875) 0 0 0 (3,875)
Unrealized holding gains (losses) on marketable securities, net of tax 8 0 0 8 0
Net income (34,118) 0 0 0 (34,118)
Ending balance at Sep. 30, 2014 $ 34,392 $ 72 $ 5,605 $ (18) $ 28,733
Ending balance, shares at Sep. 30, 2014   7,163