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Leases Supplementary Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Lease Obligation Incurred			$ 200
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 7,535	$ 8,459
Financing cash flows from finance leases	373	380
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	4,242	12,800
Finance leases	$ 76	$ 563

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Cash Flow Lessee [Abstract]

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Right Of Use Asset Obtained In Exchange For Lease Liability [Abstract]

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Amount of increase in lease obligation from new lease.

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Amount of cash outflow for principal payment on finance lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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