Note 7 - Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total adjusted EBITDA		$ 209,201	$ 178,778	$ 641,074	$ 387,942
Interest expense		(7,980)	(8,096)	(23,424)	(25,081)
Depreciation and amortization		(23,216)	(17,168)	(62,682)	(50,087)
Non-cash write-down and other adjustments	[1]	(3,333)	(477)	(638)	(1,868)
Non-cash share-based compensation expense	[2]	(5,783)	(4,353)	(18,204)	(14,327)
Loss on extinguishment of debt	[3]	0	0	(831)	0
Transaction costs and credit facility fees	[4]	(3,385)	(568)	(9,471)	(1,160)
Business optimization and other charges	[5]	0	(531)	(159)	(12,503)
Other		(140)	(300)	(717)	(711)
Income before provision for income taxes		165,364	147,285	524,948	282,205
Domestic [Member]
Total adjusted EBITDA		187,726	171,359	598,730	374,065
International [Member]
Total adjusted EBITDA		$ 21,475	$ 7,419	$ 42,344	$ 13,877

[1] Includes gains/losses on disposals of assets and investments, unrealized mark-to-market adjustments on commodity contracts, certain foreign currency related adjustments, and certain purchase accounting adjustments.

[2] Represents share-based compensation expense to account for stock options, restricted stock and other stock awards over their respective vesting periods.

[3] Represents the non-cash write-off of original issue discount and deferred financing costs due to voluntary prepayment of Term Loan debt.

[4] Represents transaction costs incurred directly in connection with any investment, as defined in our credit agreement, equity issuance, debt issuance or refinancing, together with certain fees relating to our senior secured credit facilities.

[5] For the nine months ended September 30, 2020, represents severance, non-cash asset write-downs, and other charges to address the impact of the COVID-19 pandemic and decline in oil prices.