Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable, net of allowances	$ 13,576	$ 18,573
Property and equipment, net of accumulated depreciation	$ 95,771	$ 88,453
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	38,417,000	38,341,000
Common stock, shares outstanding (in shares)	38,417,000	38,341,000