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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property and equipment acquired under finance leases	$ 3,008	$ 9,966	$ 12,941
Property and equipment in payables	1,052	1,312	1,553
Cash paid for interest	1,187	3,583	18,826
Cash paid for income taxes, net	$ 5,301	$ 7,613	$ 1,535
Class A Common Stock
Number of common stock shares issued upon redemption of CW units	9.3
Class B Common Stock
Economic interest of shares	$ 0

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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