Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Other Changes in Certain Working Capital Accounts, Net
Accounts receivable	$ 5,822	$ (20,542)
Other current assets	7,366	(7,084)
Accounts payable	30,212	15,156
Accrued employee compensation and benefits	(4,527)	(4,769)
Accrued interest	(1,323)	10,508
Other accrued liabilities	(2,812)	(4,004)
Unearned revenue	23,806	(2,501)
Other, net	(128)	(17,522)
Total	$ 58,416	$ (30,758)