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Leases - Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finance lease cost:
Amortization of lease assets	$ 53	$ 320	$ 515	$ 976
Interest on lease liabilities	16	15	50	54
Operating lease cost	29,577	30,543	89,289	91,278
Short-term lease cost	160,365	212,007	478,683	619,906
Total lease cost	$ 190,011	$ 242,885	$ 568,537	$ 712,214

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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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