Note 11 - Income Taxes (Details) - Income Tax Reconciliation (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Reconciliation [Abstract]
Income before taxes	$ 349,964	$ 257,698	$ 78,187
(Provision) benefit for income taxes at federal statutory rate	(122,488)	(90,194)	(27,365)
(Increases) decreases in tax resulting from:
State income taxes, net of federal benefit	(12,961)	(9,426)	(2,947)
Net deferred tax asset valuation (allowance) benefit	2,030	13,115	483,724
(Increases) decreases in liability for unrecognized tax benefits	(1,605)	16,105
Domestic production activities deduction	1,562
Other, net	(637)	1,417	(178)
(Provision) benefit for income taxes	$ (134,099)us-gaap_IncomeTaxExpenseBenefit	$ (68,983)us-gaap_IncomeTaxExpenseBenefit	$ 453,234us-gaap_IncomeTaxExpenseBenefit
Effective tax rate	38.30%	26.80%

Effective Income Tax Reconciliation Reversal Of Liability For Unrecognized Tax Benefits.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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