COMMITMENTS AND CONTINGENCIES (Leases: Lease Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Operating lease expense	$ 28,814	$ 30,497	$ 26,122
Amortization of finance lease assets	304	260	0
Interest on finance lease liabilities	39	39	0
Total lease expense	$ 29,157	$ 30,796	$ 26,122