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Supplemental Cash Flow Information - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ (115,597)	$ (119,357)
Operating cash flows from finance leases	(108)	(64)
Financing cash flows from finance leases	(1,198)	(1,835)
Lease assets obtained in exchange for lease liabilities:
Operating leases	69,721	96,550
Finance leases	$ 1,384	$ 691

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Right-Of-Use Asset Obtained In Exchange For Finance And Operating Lease Liabilities [Abstract]

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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