INCOME TAX PROVISION (income tax provision) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income (loss) before income taxes
U.S.		$ 62,361	$ 7,130	$ (191,843)
Foreign		31,442	19,673	(23,897)
Income (loss) before income taxes		93,803	26,803	(215,740)
Current tax provision:
Federal		(61)	17,643	36,967
State		2,389	4,502	7,400
Foreign		10,945	4,779	4,850
Total current tax provision		13,273	26,924	49,217
Deferred tax provision:
Federal		15,889	(4,480)	(35,154)
State		1,958	(1,232)	(8,239)
Foreign		(89)	256	2,215
Total deferred tax provision		17,758	(5,456)	(41,178)
Income tax provision		$ 31,031	$ 21,468	$ 8,039
Reconciliation of effective tax rate to U.S. statutory tax rate
Income tax at federal statutory rate		21.00%	21.00%	21.00%
Goodwill impairment charges (Note 8)		0.00%	46.80%	(25.60%)
Tax on repatriation of foreign earnings		4.90%	0.00%	0.00%
State income tax expense, net of federal income tax benefit		2.40%	2.10%	4.70%
Foreign tax rate differences		1.70%	4.30%	1.10%
Non-deductible executive compensation		1.70%	2.20%	(0.60%)
Non-deductible acquisition costs		1.50%	0.00%	0.00%
Tax impact of share-based compensation		0.90%	8.50%	(1.00%)
Payables and receivables for prior year tax returns		0.20%	3.20%	0.20%
Change in valuation allowances		0.10%	0.90%	(3.90%)	[1]
Research and development tax credit		(0.90%)	(3.70%)	0.50%
Change in unrecognized tax benefits, including interest and penalties		(0.60%)	(3.30%)	(0.20%)
Non-taxable income from employee life insurance policies		(0.30%)	(1.10%)	0.10%
Return to provision adjustments		0.00%	(2.60%)	0.30%
Other		0.50%	1.80%	(0.30%)
Effective tax rate		33.10%	80.10%	(3.70%)
Expense from change in valuation allowance	$ 8,432	$ 65	$ 244	$ 8,336

[1] During the quarter ended September 30, 2019, we recorded asset impairment charges related to certain intangible assets located in Australia (Note 8). As a result, we placed a full valuation allowance on the intangible-related deferred tax asset of $8,432, as we do not expect that we will realize the benefit of this deferred tax asset.