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Consolidated Balance Sheets Balance Sheet (Paranthetical) - USD ($)
shares in Thousands, $ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Current assets:    
Allowance for doubtful accounts $ 43,328 $ 39,791
Equity:    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 75,000 75,000
Common stock, shares issued 53,443 52,787
Common stock, shares outstanding 51,082 50,838
Common stock in treasury, at cost 1,932 1,520