ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	$ 1,272,290,000
Other comprehensive (loss) income	(1,219,000)	$ 6,827,000	$ 396,000
Balance at end of period	1,134,619,000	1,272,290,000
Income tax provision (benefit)	0	0	0
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	4,637,000	(1,379,000)	(1,861,000)
Other comprehensive (loss) income	(1,328,000)	6,016,000	482,000
Balance at end of period	3,309,000	4,637,000	(1,379,000)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	4,637,000	(1,379,000)	(1,864,000)
Other comprehensive (loss) income	(1,328,000)	6,016,000	485,000
Balance at end of period	$ 3,309,000	4,637,000	(1,379,000)
Unrealized Gains on Available-For-Sale Debt Securities
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period		$ 0	3,000
Other comprehensive (loss) income			(3,000)
Balance at end of period			$ 0