Note 16 - Segment Information - Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Before Income Tax	$ 31,589	$ 4,383
Interest Expense, net	15,261	15,671
Gain on Debt Extinguishment	(683)	(16,833)
Interest Income	(858)	(244)
Depreciation, Depletion and Amortization	59,897	54,943
Stock/Unit-Based Compensation	1,509	5,014
Adjusted EBITDA	$ 106,715	$ 62,934