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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Trade accounts receivable allowance $ 9,343 $ 7,432
Common Stock, par value (USD per share) $ 0.01 $ 0.01
Common Stock, shares authorized (in shares) 296,000,000 296,000,000
Common Stock, shares issued (in shares) 118,277,326 117,411,158
Treasury stock (in shares) 8,208,588 8,200,477