Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Changes in Certain Working Capital Accounts, Net
Accounts receivable	$ 12,158	$ 4,031
Other current assets	11,569	4,812
Accounts payable	14,032	4,539
Accrued employee compensation and benefits	(14,813)	(22,399)
Accrued interest	(1,172)	5,124
Other accrued liabilities	14,603	(4,789)
Unearned revenue	(3,106)	(3,339)
Other, net	863	(4,131)
Total	$ 10,996	$ (25,776)