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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 35,394     35,419       35,419 (25)
Currency translation adjustment 3,567           3,567 3,567  
Pension liability adjustments, net of tax 836           836 836  
Unrealized gain on investments, net of tax 5,917           5,917 5,917  
Dividends on common stock (211)     (211)       (211)  
Exercise of stock options 370   160   210     370  
Exercise of stock options (in shares)   23,490              
Stock-based compensation 791   791         791  
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 6   6         6  
Issuance of treasury stock under 401(k) plan 139   76   63     139  
Issuance of treasury stock under 401(k) plan (in shares)   6,998              
Balance, Ending at Mar. 31, 2012 $ 443,688 $ 37 $ 381,328 $ 102,261 $ (17,065) $ (1,233) $ (23,255) $ 442,073 $ 1,615
Balance, Ending (in shares) at Mar. 31, 2012   42,236,169