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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, 2019	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ (29,820)	$ (59,267)
Operating cash flows from finance leases	(17)	(38)
Financing cash flows from finance leases	(482)	(1,112)
Lease assets obtained in exchange for lease liabilities:
Operating leases	27,467	43,406
Finance leases	$ 220	$ 621

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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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