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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Accounts receivable, allowance $ 218,399 $ 238,897
Preferred stock, par value (in usd per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, issued (in shares) 0 0
Common stock, par value (in usd per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 450,000,000 450,000,000
Common stock, shares issued (in shares) 182,462,278 194,554,491
Common stock, shares outstanding (in shares) 182,462,278 194,554,491