Leases and Other - Components of Least Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Finance lease cost:
Amortization of ROU assets	$ 1,070	$ 918
Interest on lease liabilities	1,315	417
Operating lease cost	6,270	6,727
Short-term lease cost	261	310
Variable lease cost	942	1,699
Total lease cost, net	$ 9,858	$ 10,071

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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- Definition

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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