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Unaudited Condensed Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive (Loss) Income
Beginning balance at Dec. 31, 2012 $ 40,988 $ 114 $ 299 $ 41,311 $ (736)
Beginning balance, shares at Dec. 31, 2012    11,387,299        
Tax shortfall associated with stock-based compensation arrangements (3,286)    (421) (2,865)   
Repurchase of common stock (24,999) (5) (1,752) (23,242)   
Repurchase of common stock, shares   (495,085)      
Restricted stock grants, net of forfeitures and conversions    (1) 1      
Restricted stock grants, net of forfeitures and conversions, shares   (81,342)      
Stock-based compensation 2,250    2,250      
Change in fair value of derivative instrument, net of income tax 139          139
Net income 17,231       17,231   
Ending balance at Mar. 31, 2013 32,323 108 377 32,435 (597)
Ending balance, shares at Mar. 31, 2013   10,810,872      
Beginning balance at Dec. 31, 2013 38,902 108 7,137 31,629 28
Beginning balance, shares at Dec. 31, 2013   10,797,464      
Tax shortfall associated with stock-based compensation arrangements (1,554)    (1,554)      
Restricted stock grants, net of forfeitures and conversions               
Restricted stock grants, net of forfeitures and conversions, shares   45,837      
Stock-based compensation 1,961    1,961      
Change in fair value of derivative instrument, net of income tax 75          75
Net income 14,783       14,783   
Ending balance at Mar. 31, 2014 $ 54,167 $ 108 $ 7,544 $ 46,412 $ 103
Ending balance, shares at Mar. 31, 2014   10,843,301