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Note 7 - Income Taxes - Net Deferred Tax Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Reserves and accrued liabilities	$ 7,986	$ 7,277
Other	2,313	1,965
	10,299	9,242
Deferred tax liabilities:
Depreciation	113,773	107,453
Prepaid expenses	2,503	2,415
	116,276	109,868
Net deferred tax liability	$ 105,977	$ 100,626

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Amount of deferred tax liability attributable to taxable temporary differences.

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