Supplemental Cash Flow Information - Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	$ 16,000	$ 26,344	$ 31,201
Cash paid for income taxes, net of refunds received	$ 759	$ 3,296	$ 1,580