Income Taxes (Schedule Of Temporary Differences That Give Rise To Deferred Tax Assets (Liabilities)) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Abstract]
Accrued liabilities	$ 39,436	$ 38,620
Lease liabilities	34,028	39,057
Stock compensation expense	9,023	9,102
Implicit price concessions	7,294	7,572
State net operating loss carryforwards	1,652	1,443
Other	1,259	1,330
Deferred income tax assets	92,692	97,124
Amortization of intangible assets	(40,747)	(43,205)
Accelerated tax depreciation	(32,411)	(36,519)
Right of use lease assets	(30,891)	(35,514)
Deposit with OAS	(11,413)	(12,769)
Current assets	(4,272)	(5,064)
State income taxes	(2,552)	(2,634)
Market valuation of investments	(600)
Market valuation of investments		102
Other	(127)	(134)
Deferred income tax liabilities	(123,013)	(135,737)
Net deferred income tax liabilities	$ (30,321)	$ (38,613)

Deferred Tax Assets, Implicit Price Concessions

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Deferred Tax Assets, Tax Deferred Expense, Lease Liabilities

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Deferred Tax Liabilities, Right Of Use Lease Assets

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Deferred tax liability, deposit with OAS.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

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-Topic 210
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(26)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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-Publisher FASB
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount of deferred tax liability attributable to taxable temporary differences classified as other.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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Amount of deferred tax liability attributable to taxable temporary differences from regulatory assets.

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