Note 24 - Segment Information - Adjusted EBITDA (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings (Loss) Before Income Tax	$ 35,407	$ (9,242)	$ 98,097
Interest Expense, net	63,342	61,186	66,464
(Gain) Loss on Debt Extinguishment	(657)	(21,352)	24,455
Interest Income	(3,287)	(1,230)	(2,937)
Depreciation, Depletion and Amortization	224,583	210,760	207,097
Loss on Commodity Derivative Instruments	52,204	0	0
Pension Settlement	22	0	0
CCR Merger Fees	0	9,822	0
Stock/Unit-Based Compensation	6,632	11,579	12,760
Adjusted EBITDA	$ 378,246	$ 261,523	$ 405,936