LEASES (Supplemental Balance Sheet Information) (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating leases
Operating right-of-use assets (long-term)	$ 68,737
Operating lease liabilities (current)	17,678
Operating lease liabilities (long-term)	54,444
Total operating lease liabilities	$ 72,122
Weighted average remaining lease term (in years)	5 years 6 months
Weighted average discount rate	3.96%
Land and Structures
Operating leases
Operating right-of-use assets (long-term)	$ 66,684
Operating lease liabilities (current)	16,644
Operating lease liabilities (long-term)	53,442
Total operating lease liabilities	70,086
Equipment and Others
Operating leases
Operating right-of-use assets (long-term)	2,053
Operating lease liabilities (current)	1,034
Operating lease liabilities (long-term)	1,002
Total operating lease liabilities	$ 2,036