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Note 8 - Income Taxes - Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Federal net operating loss carryforwards $ 117,564 $ 95,861
State net operating loss carryforwards 68,925 67,357
Operating lease liability 199,083 198,800
Share-based compensation 11,276 15,029
Other 60,895 60,540
Gross deferred income tax assets 457,743 437,587
Valuation allowance (50,548) (41,281)
Deferred income tax assets, net of valuation allowance 407,195 396,306
Difference between book and tax basis of property and intangible assets 295,343 311,365
State tax liability 41,028 45,314
Right of use asset 195,038 194,874
Other 6,838 7,448
Gross deferred income tax liabilities 538,247 559,001
Deferred income tax liabilities, net $ 131,052 $ 162,695