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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, 2011 $ 42,293 $ 118 $ 295 $ 42,491 $ (611)
Beginning Balance, shares at Dec. 31, 2011   11,792,456      
Tax shortfall associated with stock-based compensation arrangements (393)   (393)    
Restricted stock grants, net of forfeitures and conversions   1 (1)    
Restricted stock grants, net of forfeitures and conversions, shares   81,834      
Stock-based compensation 5,830   5,830    
Common stock dividends (23,737)     (23,737)  
Change in fair value of derivative instrument, net of income tax 53       53
Net income 45,201     45,201  
Balance at Jun. 30, 2012 69,247 119 5,731 63,955 (558)
Balance, shares at Jun. 30, 2012   11,874,290      
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, 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  
Balance at Jun. 30, 2013 $ 50,955 $ 109 $ 3,123 $ 47,437 $ 286
Balance, shares at Jun. 30, 2013   10,870,468