LEASE (FUTURE MINIMUM LEASE PAYMENTS TABLE) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Finance Leases - Year 1		$ 6,237
Finance Leases - Year 2		2,740
Finance Leases - Year 3		1,631
Finance Leases - Year 4		579
Total minimum lease payments	$ 6,799	11,187
Less: imputed interest	(131)	(231)
Total lease liability	6,668	10,956
Finance leases - rolling Year 1	3,700
Finance leases - rolling Year 2	1,997
Finance leases - rolling Year 3	1,000
Finance leases - rolling Year 4	102
Finance Lease, Liability	6,668	10,956
Operating Leases [Member]
Lessee, Lease, Description [Line Items]
Operating Leases - Year 1		51,120
Operating Leases - Year 2		46,913
Operating Leases - Year 3		31,085
Operating Leases - Year 4		17,338
Operating Leases - Year 5		8,288
Thereafter		8,397
Total minimum lease payments	130,207	163,141
Less: Imputed Interest.	(14,392)	(21,213)
Total lease liability	115,815	141,928
Operating leases - rolling Year 1	48,051
Operating leases - rolling Year 2	38,078
Operating leases - rolling Year 3	21,233
Operating leases - rolling Year 4	11,934
Operating leases - rolling Year 5	3,829
Operating leases - rolling Thereafter	7,082
Sublease Income [Member]
Lessee, Lease, Description [Line Items]
Sub-lease income - Year 1		(3,500)
Sub-lease income - Year 2		(3,489)
Sub-lease income - Year 3		(3,123)
Sub-lease income - Year 4		(2,905)
Sub-lease income - Year 5		(2,940)
Sub-lease income - thereafter		490
Sublease Income Total	13,771	(16,447)
Sub-lease income - rolling Year 1	(3,459)
Sub-lease income - rolling Year 2	(3,295)
Sub-lease income - rolling Year 3	(2,852)
Sub-lease income - rolling Year 4	(2,940)
Sub-lease income - rolling Year 5	(1,225)
Sublease Income Total	$ (13,771)	$ 16,447