Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax assets:
Deferred rent expense	$ 175	$ 256
Operating and finance lease obligations	40,274	26,003
Asset retirement obligations	9,847	8,075
Intangible assets	9,994	8,736
Other assets	7,361	2,535
Total deferred income tax assets	67,651	45,605
Deferred income tax liabilities:
Deferred rent income	1,036	1,249
Property and equipment	46,174	44,095
Right-of-use assets	35,463	19,630
Total deferred income tax liabilities	82,673	64,974
Net deferred income tax liabilities	$ 15,022	$ 19,369

Deferred tax assets operating and finance lease obligations.

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Deferred tax liabilities right-of-use assets.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

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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 asset retirement obligations. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset.

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

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

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