Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accumulated depreciation of property and equipment	$ 232,711	$ 215,471
Accumulated amortization of intangible assets	$ 25,502	$ 25,087
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	34,488,565	32,976,416
Common stock, shares outstanding (in shares)	34,488,565	32,976,416