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Condensed Consolidated Statement of Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Treasury Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Non Controlling Interests
Balance at Dec. 31, 2009 $ 665,789 $ 5 $ (3,130) $ 428,139 $ 239,573 $ 33 $ 1,169
Balance (in shares) at Dec. 31, 2009   48,768,541          
Increase (Decrease) in Stockholders' Equity              
Net income (loss) 86,457          86,370    87
Other Comprehensive Income (loss)              
Unrealized gain on available-for-sale investments, net of income tax 417             417 0
Reclassification of adjustments for gains included in net income, net of income tax (172)             (172) 0
Foreign currency translation adjustment, net 4,909             4,840 69
Other comprehensive income (loss) 5,154             5,085 69
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net 9,220 0 274 8,946         
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net (in shares)   1,182,069          
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition [Abstract]              
Stock-based compensation - restricted stock units 12,545       12,545         
Stock-based compensation - restricted stock 1,248     1,248      
Excess tax benefit derived from stock-option exercises and vesting of restricted stock units 7,507       7,507         
Adjustments to Noncontrolling interest (216)                (216)
Dividends declared - common shares outstanding         (2,494)    
Dividends declared - restricted stock units       41 (41)    
Common share repurchased (3,785)   (3,785)        
Common share repurchased (in shares)   (76,218)          
Balance at Dec. 31, 2010 781,425 5 (6,641) 458,426 323,408 5,118 1,109
Balance (in shares) at Dec. 31, 2010   49,874,392          
Increase (Decrease) in Stockholders' Equity              
Net income (loss) 98,314          98,357    (43)
Other Comprehensive Income (loss)              
Unrealized gain on available-for-sale investments, net of income tax (773)             (773) 0
Reclassification of adjustments for gains included in net income, net of income tax (166)             (166) 0
Foreign currency translation adjustment, net (2,345)             (2,567) 222
Other comprehensive income (loss) (3,284)             (3,506) 222
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net 8,702    612 8,090         
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net (in shares)   931,667          
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition [Abstract]              
Stock-based compensation - restricted stock units 12,765       12,765         
Stock-based compensation - restricted stock 2,196       2,196         
Stock-based compensation - stock options 342     342      
Excess tax benefit derived from stock-option exercises and vesting of restricted stock units 9,525       9,525         
Dividends declared - common shares outstanding (12,550)          (12,550)      
Dividends declared - restricted stock units (9)       184 (193)      
Adjustments to noncontrolling interest 262       (96)       358
Common share repurchased (40,672)    (40,672)            
Common share repurchased (in shares)   (722,119)          
Balance at Dec. 31, 2011 857,016 5 (46,701) 491,432 409,022 1,612 1,646
Balance (in shares) at Dec. 31, 2011 50,083,940 50,083,940          
Increase (Decrease) in Stockholders' Equity              
Net income (loss) 107,962          108,079    (117)
Other Comprehensive Income (loss)              
Unrealized gain on available-for-sale investments, net of income tax 1,455             1,455 0
Reclassification of adjustments for gains included in net income, net of income tax (344)             (344) 0
Foreign currency translation adjustment, net 6,838             6,989 (151)
Other comprehensive income (loss) 7,949             8,100 (151)
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net 4,809    1,342 3,467         
Issuance of common stock related to stock-option exercises and vesting of restricted stock units, net (in shares)   715,888          
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition [Abstract]              
Stock-based compensation - restricted stock units 13,451       13,451         
Stock-based compensation - restricted stock 5,013       5,013         
Stock-based compensation - stock options 441       441         
Excess tax benefit derived from stock-option exercises and vesting of restricted stock units 7,210       7,210         
Dividends declared - common shares outstanding (20,420)          (20,420)      
Dividends declared - restricted stock units (56)       271 (327)      
Common share repurchased (256,480)    (256,480)            
Common share repurchased (in shares)   (4,258,257)          
Balance at Dec. 31, 2012 $ 726,895 $ 5 $ (301,839) $ 521,285 $ 496,354 $ 9,712 $ 1,378
Balance (in shares) at Dec. 31, 2012 46,541,571 46,541,571