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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock and Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Adoption of ASU 2016-02, Leases (Topic 842)       $ 0
Beginning Balance at Dec. 31, 2017 $ 3,581,956 $ 1,871,396 $ (20,557) 1,731,117
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock upon exercise of options   55,434    
Stock-based compensation expense   68,395    
Other comprehensive income (loss)     24,821  
Net income 290,124     290,124
Ending Balance at Mar. 31, 2018 4,020,730 1,995,225 4,264 2,021,241
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Adoption of ASU 2016-02, Leases (Topic 842)       2,474
Beginning Balance at Dec. 31, 2018 5,238,765 2,315,988 (19,582) 2,942,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock upon exercise of options   22,585    
Stock-based compensation expense   101,200    
Other comprehensive income (loss)     (6,018)  
Net income 344,052     344,052
Ending Balance at Mar. 31, 2019 $ 5,703,058 $ 2,439,773 $ (25,600) $ 3,288,885