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Consolidated Statements of Changes in Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Noncontrolling Interest [Member]
Comprehensive Income [Member]
Total
Balance - December 31, at Dec. 31, 2008 $ 3 $ 137,362 $ 197,257 $ (396) $ (127,984)     $ 206,242
Balance - December 31, (in Shares) 40,927,000       8,262,000      
Exercise of stock options   3,904           3,904
Exercise of stock options (in Shares) 594,000              
Tax benefit from stock based compensation               497
Tax benefit from exercise of options   497           497
Issuance of fully vested restricted stock (in Shares) 329,000              
Stock-based compensation   5,940           5,940
Unrealized holding gain on marketable securities net of taxes       1,096     1,096 1,096
Net income     50,107       50,107 50,107
Comprehensive income             51,203  
Forfeiture of accrued dividends     1         1
Balance - December 31, at Dec. 31, 2009 3 147,703 247,365 700 (127,984)     267,787
Balance - December 31, (in Shares) 42,020,000       8,403,000      
Exercise of stock options 1 5,081           5,082
Exercise of stock options (in Shares) 646,000              
Tax benefit from stock based compensation   4,718           4,718
Issuance of fully vested restricted stock (in Shares) 447,000              
Stock-based compensation   8,271           8,271
Unrealized holding gain on marketable securities net of taxes       272     272 272
Net income     75,725       75,725 75,725
Comprehensive income             75,997  
Forfeiture of accrued dividends     2         2
Common stock purchased for treasury         (4,559)     (4,559)
Common stock purchased for treasury (in Shares)         141,000      
Balance - December 31, at Dec. 31, 2010 4 165,773 323,092 972 (132,543)     357,298
Balance - December 31, (in Shares) 43,005,000       8,403,000      
Exercise of stock options 1 4,994           4,995
Exercise of stock options (in Shares) 439,000              
Tax benefit from stock based compensation               4,154
Tax benefit from exercise of options   4,154           4,154
Issuance of fully vested restricted stock (in Shares) 546,000              
Stock-based compensation   11,404           11,404
Foreign currency translation adjustment       (209)     (209) (209)
Unrealized holding gain on marketable securities net of taxes       (85)     (85) (85)
Net income     97,319     (118) 97,201 97,201
Comprehensive income             96,907  
Balance - December 31, at Dec. 31, 2011 $ 5 $ 186,325 $ 420,411 $ 678 $ (132,543) $ (118)   $ 474,758