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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $)
In Thousands, except Share data
Total
Common Stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Treasury stock [Member]
Treasury stock reserved for deferred compensation [Member]
Accumulated other comprehensive income (loss) [Member]
Parent [Member]
Noncontrolling interest [Member]
Balance, Beginning at Dec. 31, 2011 $ 396,879 $ 37 $ 380,295 $ 67,053 $ (17,338) $ (1,233) $ (33,575) $ 395,239 $ 1,640
Balance, Beginning (in shares) at Dec. 31, 2011   42,205,681              
Net income 98,548     99,054       99,054 (506)
Currency translation adjustment (5,816)           (5,816) (5,816)  
Pension liability adjustments, net of tax 2,508           2,508 2,508  
Unrealized loss on investments, net of tax (16)           (16) (16)  
Dividends on common stock (634)     (634)       (634)  
Exercise of stock options 925   285   640     925  
Exercise of stock options (in shares)   71,310              
Acquisitions 26,341               26,341
Consolidated joint venture (84)               (84)
Stock-based compensation 2,959   2,959         2,959  
Tax benefit related to stock-based compensation 185   185         185  
Issuance of treasury stock under 401(k) plan 453   274   179     453  
Issuance of treasury stock under 401(k) plan (in shares)   19,991              
Balance, Ending at Sep. 30, 2012 $ 522,248 $ 37 $ 383,998 $ 165,473 $ (16,519) $ (1,233) $ (36,899) $ 494,857 $ 27,391
Balance, Ending (in shares) at Sep. 30, 2012   42,296,982