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Note 5 - Net Deferred Tax Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Reserves and accrued liabilities	$ 7,219	$ 6,049
Other	2,721	2,847
	9,940	8,896
Deferred tax liabilities:
Depreciation	141,255	125,697
Prepaid expenses	3,049	2,843
	144,304	128,540
Net deferred tax liability	$ 134,364	$ 119,644

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