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CONDENSED CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Condensed Consolidated Balance Sheet (Parenthetical) [Abstract]    
Trade receivables, allowance for doubtful accounts $ 42,309 $ 41,511
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, Shares Authorized 400,000,000 400,000,000
Common Stock, Shares, Issued 122,991,778 122,780,261
Common Stock, Shares, Outstanding 122,991,778 122,780,261