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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, 2019	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ (29,908)	$ (89,175)
Operating cash flows from finance leases	(15)	(53)
Financing cash flows from finance leases	(411)	(1,523)
Lease assets obtained in exchange for lease liabilities:
Operating leases	32,701	76,107
Finance leases	$ 10	$ 631

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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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