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Condensed Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Preferred Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Treasury Stock [Member]
Beginning Balance at Dec. 31, 2012 $ 163,514 $ 419 $ 1 $ 38,684 $ 127,511   $ (3,101)
Beginning balance, shares at Dec. 31, 2012   41,889 108       (1,018)
Stock option exercises (1,610) 19   7,646     (9,275)
Stock option exercises, shares 1,925 1,925          
Restricted stock awards (1,021) 9   (9)     (1,021)
Restricted stock awards, shares   850          
Purchases of treasury stock (28,077)           (28,077)
Retirement of treasury shares   (17)   (10,278)     10,295
Retirement of treasury shares, shares   (1,683)          
Stock-based compensation 2,928     2,928      
Net income 28,988       28,988    
Change in net unrealized gains (losses) [1] (2,608)         (2,608)  
Excess tax benefit (shortfall), net [2] 4     4      
Declaration of dividends (6,090)       (6,090)    
Ending Balance at Jun. 30, 2013 $ 156,028 $ 430 $ 1 $ 38,975 $ 150,409 $ (2,608) $ (31,179)
Ending balance, shares at Jun. 30, 2013   42,981 108       (7,684)
[1] Represents change in fair value of AFS investments for the period presented, net of tax benefit of $1,638 thousand.
[2] Excess tax benefits are related to stock-based compensation.