Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets, Current [Abstract]
Allowance for doubtful accounts	$ 2,998	$ 1,444
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	110,000,000	110,000,000
Common stock, shares issued (in shares)	59,351,326	59,134,173
Common stock, shares outstanding (in shares)	59,351,326	59,134,173
Preferred Stock [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Series A Junior Participating Preferred Stock [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, shares authorized (in shares)	75,000	75,000