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Details of Selected Balance Sheet Accounts - Other Noncurrent Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Details of Selected Balance Sheet Accounts [Abstract]
Deferred compensation plan	$ 24,609	$ 22,801
Deferred financing costs	2,886	0
Deferred income taxes	1,281	1,280
Other	5,089	5,646
Other noncurrent assets	$ 33,865	$ 29,727

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Details of Selected Balance Sheet Accounts [Abstract]

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Amount of deferred cost, excluding capitalized cost related to contract with customer; classified as noncurrent.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

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Amount of noncurrent assets classified as other.

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