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Income Taxes (Schedule Of Temporary Differences That Give Rise To Deferred Tax Assets (Liabilities)) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Taxes [Abstract] |  |
Accrued liabilities | $ 42,151 | $ 32,498
Lease liabilities | 35,888 | 32,476
Implicit price concessions | 7,031 | 4,165
Stock compensation expense | 4,047 | 5,425
State net operating loss carryforwards | 2,030 | 2,678
Other | 888 | 592
Deferred income tax assets | 92,035 | 77,834
Amortization of intangible assets | (40,619) | (39,377)
Right of use lease assets | (32,788) | (28,807)
Accelerated tax depreciation | (31,686) | (21,942)
Current assets | (3,921) | (2,510)
Market valuation of investments | (2,382) | (2,058)
State income taxes | (1,161) | (1,477)
Other | (142) | (167)
Deferred income tax liabilities | (112,699) | (96,338)
Net deferred income tax liabilities | $ (20,664) | $ (18,504)

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