Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for credit loss	$ 5,171	$ 11,143
Property and equipment, accumulated depreciation	$ 510,103	$ 478,906
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	169,231	169,622
Common stock, shares outstanding	169,231	169,622