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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 Income (Loss)
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 (3,521)   (656) (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               
Restricted stock grants, net of forfeitures and conversions, shares   (21,746)      
Stock-based compensation 5,232    5,232      
Change in fair value of derivative instrument, net of income tax 1,022       1,022
Net income 32,233     32,233  
Ending balance at Jun. 30, 2013 50,955 109 3,123 47,437 286
Ending balance, shares at Jun. 30, 2013   10,870,468      
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 (1,811)   (1,811)    
Repurchase of common stock               
Repurchase of common stock, shares           
Restricted stock grants, net of forfeitures and conversions   1 (1)    
Restricted stock grants, net of forfeitures and conversions, shares   108,379      
Stock-based compensation 4,507   4,507    
Change in fair value of derivative instrument, net of income tax (95)       (95)
Net income 28,460     28,460  
Ending balance at Jun. 30, 2014 $ 69,963 $ 109 $ 9,832 $ 60,089 $ (67)
Ending balance, shares at Jun. 30, 2014   10,905,843