Leases - Lease Cost (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Finance lease cost
Amortization of finance lease assets	$ 1,896
Interest on lease liabilities	521
Operating lease cost	100,384
Variable lease cost	11,663
Short-term lease cost	1,874
Net lease cost	$ 116,338

Amount of interest expense on finance lease liability.

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-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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.

+ References

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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