Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Finance lease payments	[1]	$ 5,295	$ 12,241
Related Parties [Member]
Finance lease payments		$ 0	$ 6,382

[1] For the nine months ended September 30, 2020, includes related-party payments of $6.4 million.