LEASE (FUTURE MINIMUM LEASE PAYMENTS TABLE) (Details) - USD ($) $ in Thousands	Mar. 31, 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	$ 9,516	11,187
Less: imputed interest	(192)	(231)
Total lease liability	9,324	10,956
Finance leases - rolling Year 1	5,609
Finance leases - rolling Year 2	2,150
Finance leases - rolling Year 3	1,402
Finance leases - rolling Year 4	355
Finance Lease, Liability	9,324	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	151,845	163,141
Less: Imputed Interest.	(18,835)	(21,213)
Total lease liability	133,010	141,928
Operating leases - rolling Year 1	49,738
Operating leases - rolling Year 2	45,668
Operating leases - rolling Year 3	26,224
Operating leases - rolling Year 4	16,167
Operating leases - rolling Year 5	6,467
Operating leases - rolling Thereafter	7,581
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	15,570	(16,447)
Sub-lease income - rolling Year 1	(3,500)
Sub-lease income - rolling Year 2	(3,488)
Sub-lease income - rolling Year 3	(2,947)
Sub-lease income - rolling Year 4	(2,940)
Sub-lease income - rolling Year 5	(2,695)
Sublease Income Total	$ (15,570)	$ 16,447