Note 13 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 13, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income before taxes	$ 349,964	$ 753,116	$ 342,489	$ 349,964
(Provision) benefit for income taxes at federal statutory rate		(263,591)	(119,871)	(122,488)
State income taxes, net of federal benefit		(24,649)	(11,680)	(12,961)
Net deferred tax asset valuation (allowance) benefit		(371)	1,405	2,030
(Increases) decreases in liability for unrecognized tax benefits		(466)	(1,611)	(1,605)
Nondeductible expenses and credits		364	(2,164)
Domestic production activities deduction		18,324	6,150	1,562
Other, net		2,003	(1,209)	(637)
(Provision) benefit for income taxes	$ (134,099)	$ (268,386)	$ (128,980)	$ (134,099)
Effective tax rate		35.60%	37.70%	38.30%