ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Loss
Balance at beginning of period	$ (1,414,417,000)
Other comprehensive income (loss) before reclassifications	(142,300,000)	$ 40,654,000	$ (7,942,000)
Amounts reclassified into earnings		(168,000)
Net current period other comprehensive loss		40,486,000	(7,942,000)
Allocation of accumulated other comprehensive loss related to the noncontrolling interests		628,000	315,000
Separation of IAC		13,781,000
Balance at end of period	(203,769,000)	(1,414,417,000)
Tax benefit / provision in accumulated other comprehensive loss	0	0	0
Accumulated Other Comprehensive (Loss)
Accumulated Other Comprehensive Loss
Balance at beginning of period	(81,454,000)	(136,349,000)	(128,722,000)
Balance at end of period	(223,754,000)	(81,454,000)	(136,349,000)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Loss
Balance at beginning of period	(81,454,000)	(136,349,000)	(128,726,000)
Other comprehensive income (loss) before reclassifications	(142,300,000)	40,655,000	(7,938,000)
Amounts reclassified into earnings	0	(168,000)	0
Net current period other comprehensive loss		40,487,000	(7,938,000)
Allocation of accumulated other comprehensive loss related to the noncontrolling interests		628,000	315,000
Separation of IAC		13,780,000
Balance at end of period	(223,754,000)	(81,454,000)	(136,349,000)
Unrealized (Loss) Gain on Available-For-Sale Security
Accumulated Other Comprehensive Loss
Balance at beginning of period	$ 0	0	4,000
Other comprehensive income (loss) before reclassifications		(1,000)	(4,000)
Amounts reclassified into earnings		0
Net current period other comprehensive loss		(1,000)	(4,000)
Allocation of accumulated other comprehensive loss related to the noncontrolling interests		0	0
Separation of IAC		1,000
Balance at end of period		$ 0	$ 0