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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Accounts receivable, allowance $ 3,737 $ 4,645
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 307,662,000 305,751,000
Common stock, shares outstanding 307,662,000 305,751,000
Common stock in treasury, shares 172,244,000 162,044,000