LEASES (Lease Costs) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lease cost:
Operating lease expense	$ 7,520	$ 18,584
Short-term lease expense	196	961
Sublease income	(343)	(1,077)
Total lease expense	7,373	18,468
Other information
Operating cash outflows from operating leases	6,397	19,317
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 0
Weighted-average remaining lease term - operating leases	9 years	9 years
Weighted-average discount rate - operating lease	4.70%	4.70%