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Income Taxes (Schedule Of Deferred Income Tax Assets And Liabilities) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Accruals not currently deductible | $ 5,111,242 | $ 4,546,767
Stock based compensation | 9,586,372 | 8,594,640
Other | 356,039 | 3,679,680
Total deferred income tax assets | 15,053,653 | 16,821,087
Liabilities: |  |
Excess tax over book depreciation | (39,835,025) | (46,123,681)
Goodwill | (23,341,226) | (18,972,334)
Intangible assets | (5,089,042) | (4,172,726)
Other | (1,309,849) | (6,440,990)
Total deferred income tax liability | (69,575,142) | (75,709,731)
Net deferred income taxes | $ (54,521,489) | $ (58,888,644)

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