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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $)
In Thousands, except Share data
Total
USD ($)
Common Stock [Member]
Additional paid-in capital [Member]
USD ($)
Retained earnings [Member]
USD ($)
Treasury stock [Member]
USD ($)
Treasury stock reserved for deferred compensation [Member]
USD ($)
Accumulated other comprehensive income (loss) [Member]
USD ($)
Parent [Member]
USD ($)
Noncontrolling interest [Member]
USD ($)
Balance, Beginning at Dec. 31, 2012 $ 620,613   $ 507,199 $ 161,729 $ (16,445) $ (1,075) $ (56,954) $ 594,454 $ 26,159
Balance, Beginning (in shares) at Dec. 31, 2012   48,562,204              
Net income 19,389     19,475       19,475 (86)
Currency translation adjustment 504           504 504  
Pension liability adjustments, net of tax 951           951 951  
Unrealized loss on investments, net of tax (3)           (3) (3)  
Dividends on common stock (268)     (268)       (268)  
Note conversion (45,903)   (45,903)         (45,903)  
Note conversion (in shares)   4,903,044              
Exercise of stock options 739   360   379     739  
Exercise of stock options (in shares)   42,253              
Stock-based compensation 963   963         963  
Tax benefit related to stock-based compensation (29)   (29)         (29)  
Issuance of treasury stock under 401(k) plan 154   92   62     154  
Issuance of treasury stock under 401(k) plan (in shares)   6,930              
Balance, Ending at Mar. 31, 2013 $ 688,916   $ 554,488 $ 180,936 $ (16,004) $ (1,075) $ (55,502) $ 662,843 $ 26,073
Balance, Ending (in shares) at Mar. 31, 2013   53,514,431