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Note 5 - Net Deferred Tax Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Reserves and accrued liabilities	$ 8,490	$ 7,219
Other	2,757	2,721
	11,247	9,940
Deferred tax liabilities:
Depreciation	155,936	141,255
Prepaid expenses	3,165	3,049
	159,101	144,304
Net deferred tax liability	$ 147,854	$ 134,364

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