Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable, current $ 6,073 $ 4,285
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares outstanding 63,811,000 64,371,000
Common stock, shares issued 63,811,000 64,371,000