LEASES (Summary of operating lease assets and liabilities recorded on the balance sheet) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Operating lease assets and liabilities recorded on the balance sheet
Right-of-use assets - operating leases	$ 50,320
Current portion of lease liabilities - operating leases	3,035
Lease liabilities - operating leases, net of current portion	54,168
Total operating lease liabilities	$ 57,203
Weighted average remaining lease term (in years)	13 years 3 months 18 days