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Supplemental Cash Flow Information - Supplemental Cash Flow Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ (29,333)	$ (29,908)	$ (88,570)	$ (89,175)
Operating cash flows from finance leases	(16)	(15)	(50)	(53)
Financing cash flows from finance leases	(102)	(411)	(525)	(1,523)
Lease assets obtained in exchange for lease liabilities:
Operating leases	16,619	32,701	56,970	76,107
Finance leases	$ 275	$ 10	$ 1,158	$ 631

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Cash Flow, Lessee [Abstract]

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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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