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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 79,719     79,475       79,475 244
Currency translation adjustment (4,569)           (4,569) (4,569)  
Pension liability adjustments, net of tax 1,672           1,672 1,672  
Unrealized gain on investments, net of tax 337           337 337  
Dividends on common stock (423)     (423)       (423)  
Exercise of stock options 887   269   618     887  
Exercise of stock options (in shares)   68,898              
Consolidated joint venture (84)               (84)
Stock-based compensation 2,175   2,175         2,175  
Tax benefit related to stock-based compensation 190   190         190  
Issuance of treasury stock under 401(k) plan 293   173   120     293  
Issuance of treasury stock under 401(k) plan (in shares)   13,353              
Balance, Ending at Jun. 30, 2012 $ 477,076 $ 37 $ 383,102 $ 146,105 $ (16,600) $ (1,233) $ (36,135) $ 475,276 $ 1,800
Balance, Ending (in shares) at Jun. 30, 2012   42,287,932