LEASES (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 8,558,000
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 7,774,000
Operating Lease, Weighted Average Discount Rate, Percent	6.00%
Operating Lease, Weighted Average Remaining Lease Term	6 years
Lease, Cost	$ 9,100,000
Operating Lease, Payments	9,000,000.0
Operating Leases, Rent Expense, Net	10,200,000	$ 10,300,000	$ 9,500,000
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two	6,603,000
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three	5,665,000
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four	4,946,000
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five	5,071,000
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five	11,758,000
Lessee, Operating Lease, Liability, Payments, Due	41,817,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(7,485,000)
Operating Lease, Liability	34,332,000
Operating Lease, Liability, Current	5,870,000	6,645,000
Operating Lease, Liability, Noncurrent	28,462,000	28,127,000
Operating Leases, Future Minimum Payments, Due in Two Years	7,259,000
Operating Leases, Future Minimum Payments, Due in Three Years	6,195,000
Operating Leases, Future Minimum Payments, Due in Four Years	5,383,000
Operating Leases, Future Minimum Payments, Due in Five Years	5,513,000
Operating Leases, Future Minimum Payments, Due Thereafter	11,776,000
Operating Leases, Future Minimum Payments Due	44,684,000
Restructuring Reserve	3,687,000	157,000
Operating Leases, Income Statement, Sublease Revenue	800,000	1,300,000	1,200,000
Finance Lease, Liability, Payments, Due Next Twelve Months	289,000
Finance Lease, Liability, Payments, Due in Rolling Year Two	255,000
Finance Lease, Liability, Payments, Due in Rolling Year Three	226,000
Finance Lease, Liability, Payment, Due	770,000
Finance Lease, Liability, Undiscounted Excess Amount	(23,000)
Finance Lease, Liability	747,000
Finance Lease, Liability, Current	275,000
Finance Lease, Liability, Noncurrent	$ 472,000	$ 0
Finance Lease, Weighted Average Discount Rate, Percent	230.00%
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 5,700,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	7 years
Operating Leases on Vacated Facilities [Member]
Lessee, Lease, Description [Line Items]
Effect on Future Cash Flows, Amount	$ 2,000,000.0
Facilities-Related [Member]
Lessee, Lease, Description [Line Items]
Restructuring Reserve	$ 0	$ 0	$ 318,000	$ 2,479,000