COMMITMENTS AND CONTINGENCIES (Leases: Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease expense	$ 7,314	$ 21,463
Amortization of finance lease assets	89	194
Interest on finance lease liabilities	9	30
Total lease expense	$ 7,412	$ 21,687