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CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance $ 280,988 $ 264,144
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, issued 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 450,000,000 450,000,000
Common stock, shares issued 217,338,629 217,120,346
Common stock, shares outstanding 206,392,776 209,754,247
Treasury stock, shares 10,945,853 7,366,099