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Supplemental Cash Flow Information - Supplemental Cash Flow Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ (26,789)	$ (29,755)	$ (54,399)	$ (59,237)
Operating cash flows from finance leases	(23)	(17)	(50)	(34)
Financing cash flows from finance leases	(271)	(222)	(520)	(423)
Lease assets obtained in exchange for lease liabilities:
Operating leases	6,678	10,658	24,605	40,351
Finance leases	118	17	286	883
Rental purchase option assets obtained in exchange for rental purchase option liabilities	$ 5,577	$ 160	$ 5,880	$ 9,923

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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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