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Leases - Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finance lease cost:
Amortization of lease assets	$ 230	$ 260	$ 474	$ 462
Interest on lease liabilities	23	17	50	34
Operating lease cost	26,947	29,975	54,723	59,712
Short-term and variable lease cost	160,342	147,953	318,241	318,318
Total lease cost	$ 187,542	$ 178,205	$ 373,488	$ 378,526

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Finance Leases, Cost [Abstract]

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Short-Term Lease And Variable Lease, Cost

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- Definition

Amount of interest expense on finance lease liability.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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