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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [Member]
Non-Controlling Interests [Member]
Balance at Dec. 31, 2011 $ 40,297 $ 1,066 $ 874,753 $ (822,625) $ (22,344) $ 9,447
Balance (in shares) at Dec. 31, 2011   106,573,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 53,832     49,999   3,833
Foreign currency translation adjustment 3,149       3,149  
Stock-based compensation, value 833   833      
Repurchase of common stock, shares   (36,000)        
Repurchase of common stock, value (116) (1) 316 (431)    
Forfeiture of restricted stock, shares   (20,000)        
Forfeiture of restricted stock, value (127)   (127)      
Issuance of notes receivable due from stockholders (47)   (47)      
Repayments of notes receivable due from stockholders 1,463   1,463      
Distributions to noncontrolling interests (4,160)         (4,160)
Balance at Mar. 31, 2012 95,124 1,065 877,191 (773,057) (19,195) 9,120
Balance (in shares) at Mar. 31, 2012   106,517,000        
Balance at Dec. 31, 2012 220,205 1,211 1,000,963 (773,085) (14,801) 5,917
Balance (in shares) at Dec. 31, 2012 121,148,451 121,148,000        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 65,056     63,223   1,833
Foreign currency translation adjustment (4,532)       (4,532)  
Stock-based compensation, value 4,494   4,494      
Exercise of stock options, shares   1,212,000        
Exercise of stock options, common stock value 10,639 12 10,627      
Issuance of restricted stock, shares   219,000        
Issuance of restricted stock, value 3 3 0      
Forfeiture of restricted stock, shares   (10,000)        
Forfeiture of restricted stock, value (3)   (3)      
Repayments of notes receivable due from stockholders 5,312   5,312      
Distributions to noncontrolling interests (2,435)         (2,435)
Balance at Mar. 31, 2013 $ 298,739 $ 1,226 $ 1,021,393 $ (709,862) $ (19,333) $ 5,315
Balance (in shares) at Mar. 31, 2013 122,569,475 122,569,000