NEW ACCOUNTING STANDARDS (NARRATIVE) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018
Lease, Practical Expedients, Package [true false]	true
Lease, Practical Expedient, Use of Hindsight [true false]	false
Lease, Practical Expedient, Lessor Single Lease Component [true false]	true
Deferred revenue - current	$ 39,716		$ 44,926	$ 35,200
Minimum
Operating Lease, Liability		$ 129,900
Maximum
Operating Lease, Liability		$ 148,300