Leases (Breakdown of Lease Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Leases
Operating lease cost	$ 17,932	$ 16,927
Amortization of leased assets	10,804	9,268
Interest on lease liabilities	814	915
Short-term lease cost	10,046	9,799
Sublease income	(76)	(429)
Lease expense	$ 39,520	$ 36,480

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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- 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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- Definition

Amount of sublease income excluding finance and operating lease expense.

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