Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash paid for interest and income taxes
Interest	$ 80,069	$ 79,846	$ 86,723
Income taxes	$ 4,635	$ 40,626	$ 688