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Income Taxes (Schedule Of Temporary Differences That Give Rise To Deferred Tax Assets (Liabilities)) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Income Taxes [Abstract] |  |
Accrued liabilities | $ 32,498 | $ 30,702
Lease liabilities | 32,476 |
Stock compensation expense | 5,425 | 5,894
Implicit price concessions | 4,165 | 1,171
State net operating loss carryforwards | 2,678 | 2,422
Other | 894 | 626
Deferred income tax assets | 78,136 | 40,815
Amortization of intangible assets | (39,679) | (38,346)
Right of use lease assets | (28,807) |
Accelerated tax depreciation | (21,942) | (19,685)
Current assets | (2,510) | (1,861)
Market valuation of investments | (2,058) | (1,068)
State income taxes | (1,477) | (1,261)
Other | (167) | (192)
Deferred income tax liabilities | (96,640) | (62,413)
Net deferred income tax liabilities | $ (18,504) | $ (21,598)

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