Note 7 - Segment Information - EBITDA Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Net income (loss)	$ 28,496	$ (12,721)	$ 49,090	$ (45,022)	$ 22,457
Interest expense, net	2,185	414	2,613	1,105
Income tax benefit	(893)	(2,393)	(953)	(5,629)
Depreciation and amortization	54,387	32,833	100,730	64,439
Other (income) expense, net	1,106	1,456	486	(106)
(Gain) loss on disposal of assets	49	(3,136)	(440)	(9,192)
Acquisition-related and other transaction costs	243	298	970	298
Severance and business divestiture costs	40	513	6,180	513
Restructuring costs	2,163	7,846	2,786	7,630
Adjusted EBITDA	$ 87,776	$ 25,110	161,462	29,694
Share-based compensation expense acceleration				$ 15,658