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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, 2010 $ 176,004 $ 133 $ 1,206 $ 174,625 $ 40
Beginning Balance, shares at Dec. 31, 2010   13,316,822      
Tax shortfall associated with stock-based compensation arrangements (569)    (569)      
Repurchase of common stock (202,664) (16) (13,575) (189,073)   
Repurchase of common stock, shares   (1,581,444)      
Restricted stock forfeitures and cancellations, net of grants    1 (1)      
Restricted stock forfeitures and cancellations, net of grants, shares   57,078      
Stock-based compensation 13,234    13,234      
Common stock dividends (49,105)       (49,105)   
Change in net unrealized gains and losses on marketable securities, net of income tax (40)          (40)
Change in fair value of derivative instrument, net of income tax (611)          (611)
Net income 106,044       106,044   
Balance at Dec. 31, 2011 42,293 118 295 42,491 (611)
Balance, shares at Dec. 31, 2011    11,792,456       
Tax shortfall associated with stock-based compensation arrangements (245)    (245)      
Repurchase of common stock (25,001) (5) (5,214) (19,782)   
Repurchase of common stock, shares   (484,841)      
Restricted stock forfeitures and cancellations, net of grants    1 (1)      
Restricted stock forfeitures and cancellations, net of grants, shares   79,684      
Stock-based compensation 5,464    5,464      
Common stock dividends (47,328)       (47,328)   
Change in fair value of derivative instrument, net of income tax (125)          (125)
Net income 65,930       65,930   
Balance at Dec. 31, 2012 40,988 114 299 41,311 (736)
Balance, shares at Dec. 31, 2012    11,387,299        
Tax shortfall associated with stock-based compensation arrangements (3,567)    (702) (2,865)   
Repurchase of common stock (24,999) (5) (1,752) (23,242)   
Repurchase of common stock, shares   (495,085)      
Restricted stock forfeitures and cancellations, net of grants    (1) 1      
Restricted stock forfeitures and cancellations, net of grants, shares   (94,750)      
Stock-based compensation 9,291    9,291      
Change in fair value of derivative instrument, net of income tax 764          764
Net income 16,425      16,425   
Balance at Dec. 31, 2013 $ 38,902 $ 108 $ 7,137 $ 31,629 $ 28
Balance, shares at Dec. 31, 2013   10,797,464