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Consolidated Statements of Equity - USD ($)
shares in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Noncontrolling Interests [Member]
Balance at Dec. 31, 2015 $ 2,437,846,000 $ 937,000 $ 926,235,000 $ 1,510,356,000 $ 318,000
Balance, Shares at Dec. 31, 2015   93,739      
Net income (loss) 324,596,000     324,914,000 $ (318,000)
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 22,022,000 $ 5,000 22,017,000    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   473      
Issuance of restricted stock   $ 5,000 (5,000)    
Issuance of restricted stock, shares   505      
Stock-based compensation expense 34,000,000   34,000,000    
Forfeitures of restricted stock   $ (1,000) 1,000    
Forfeitures of restricted stock, shares   53      
Repurchased common stock (61,828,000) $ (9,000) (12,075,000) (49,744,000)  
Repurchased common stock, shares   (946)      
Excess tax benefit related to employee stock incentive plans 4,131,000   4,131,000    
Balance at Dec. 31, 2016 2,760,767,000 $ 937,000 974,304,000 1,785,526,000  
Balance, Shares at Dec. 31, 2016   93,718      
Net income (loss) 320,372,000     320,372,000  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 23,276,000 $ 5,000 23,271,000    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   528      
Issuance of restricted stock   $ 5,000 (5,000)    
Issuance of restricted stock, shares   536      
Issuance of restricted stock for acquisition consideration 2,658,000 $ 1,000 2,657,000    
Issuance of restricted stock for acquisition consideration, shares   69      
Stock-based compensation expense 29,573,000   29,573,000    
Forfeitures of restricted stock   $ (1,000) 1,000    
Forfeitures of restricted stock, shares   92      
Repurchased common stock (70,192,000) $ (10,000) (12,473,000) (57,709,000)  
Repurchased common stock, shares   (1,038)      
Balance at Dec. 31, 2017 3,066,454,000 $ 937,000 1,017,328,000 2,048,189,000  
Balance, Shares at Dec. 31, 2017   93,721      
Net income (loss) 268,629,000     268,629,000  
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan 18,919,000 $ 5,000 18,914,000    
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares   495      
Issuance of restricted stock   $ 8,000 (8,000)    
Issuance of restricted stock, shares   770      
Stock-based compensation expense 38,703,000   38,703,000    
Stock swaps (2,661,000) $ (1,000) (2,660,000)    
Stock swaps,shares   (56)      
Forfeitures of restricted stock   $ (1,000) 1,000    
Forfeitures of restricted stock, shares   (69)      
Repurchased common stock (302,160,000) $ (70,000) (79,631,000) (222,459,000)  
Repurchased common stock, shares   (7,041)      
Excess tax benefit related to employee stock incentive plans 0        
Balance at Dec. 31, 2018 $ 3,087,884,000 $ 878,000 $ 992,647,000 $ 2,094,359,000  
Balance, Shares at Dec. 31, 2018   87,820