LEASE COST (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Lease Cost Table Line Items
Total lease cost	$ 61,175
Depreciation and Amortization [Member]
Lease Cost Table Line Items
Amortization of ROU assets - finance leases	7,157
Interest Expense
Lease Cost Table Line Items
Interest on lease liabilities - finance leases	141
Cost of Services
Lease Cost Table Line Items
Operating lease cost (cost resulting from lease payments)	47,269
Short-term Lease, Cost	4,338
Selling General And Administrative Expenses [Member]
Lease Cost Table Line Items
Operating lease cost (cost resulting from lease payments)	3,731
Sublease Income	(445)
Other income (expense), net
Lease Cost Table Line Items
Operating lease cost (cost resulting from lease payments)	968
Sublease Income	$ (1,984)