LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease costs	$ 6,882	$ 7,659	$ 21,573	$ 23,042
Variable lease costs	1,146	1,774	3,727	4,702
Finance lease costs:
Amortization of right-of-use assets	110	106	328	214
Interest on lease liabilities	80	78	242	251
Total lease costs	$ 8,218	$ 9,617	$ 25,870	$ 28,209