ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Balance at beginning of period	$ 217,694	$ 589,100	$ 140,258	[1]	$ 397,340
Change in accumulated other comprehensive income (loss)	(5,237)	5,076	(5,673)		(21,925)
Balance at end of period	(140,853)	709,225	(140,853)		709,225
Accumulated other comprehensive income (loss) [Member]
Balance at beginning of period	(2,591)	(22,111)	(2,155)		4,890
Change in accumulated other comprehensive income (loss)	(5,237)	5,076	(5,673)		(21,925)
Balance at end of period	(7,828)	(17,035)	(7,828)		(17,035)
Foreign currency [Member]
Balance at beginning of period	(2,591)	(22,111)	(2,155)		4,890
Change in accumulated other comprehensive income (loss)	(5,237)	5,076	(5,673)		(21,925)
Balance at end of period	$ (7,828)	$ (17,035)	$ (7,828)		$ (17,035)

[1] The balance sheet at December 31, 2020, has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by United States generally accepted accounting principles for complete financial statements.