Supplemental Cash Flow Information - Additional Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ (64,805)	$ (34,935)	$ (19,373)
Income taxes paid	(116,467)	(112,895)	(112,335)
Income tax refunds	$ 7,174	$ 5,209	$ 9,845