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Leases - Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finance lease cost:
Amortization of lease assets	$ 260	$ 283	$ 462	$ 656
Interest on lease liabilities	17	18	34	39
Operating lease cost	29,975	30,377	59,712	60,735
Short-term lease cost	147,953	194,630	318,318	394,928
Total lease cost	$ 178,205	$ 225,308	$ 378,526	$ 456,358

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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.

+ References

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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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