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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in-Capital [Member]
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative-effect adjustment for adoption of ASU 2016-09 $ 4,724     $ 2,040 $ 2,684
Balance (shares) at Dec. 31, 2016   236,344 857    
Balance at Dec. 31, 2016 2,923,157 $ 2,331 $ (15,950) 2,345,271 591,505
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Fees (2016 issuance of common stock) (shares)   0      
Fees (2016 issuance of common stock) (55) $ 0   (55)  
Stock-based compensation (shares)   1,441      
Stock-based compensation 14,842 $ 14   14,828  
Treasury stock - tax withholdings (shares)   (375) 375    
Treasury stock - tax withholdings (5,451)   $ (5,451)    
Net income 40,393       40,393
Balance (shares) at Jun. 30, 2017   237,410 1,232    
Balance at Jun. 30, 2017 $ 2,977,610 $ 2,345 $ (21,401) $ 2,362,084 $ 634,582