LEASES Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating leases
Operating right-of-use assets (long-term)	$ 115,195	$ 68,470
Operating lease liabilities (current)	21,482	20,265
Operating lease liabilities (long-term)	97,839	52,277
Total operating lease liabilities	$ 119,321	$ 72,542
Weighted average remaining lease term (in years)	6 years 8 months 12 days	5 years 3 months 18 days
Weighted average discount rate	3.18%	3.77%
Land and Structures
Operating leases
Operating right-of-use assets (long-term)	$ 114,908	$ 67,227
Operating lease liabilities (current)	21,207	19,293
Operating lease liabilities (long-term)	97,828	52,008
Total operating lease liabilities	119,035	71,301
Equipment and Others
Operating leases
Operating right-of-use assets (long-term)	287	1,243
Operating lease liabilities (current)	275	972
Operating lease liabilities (long-term)	11	269
Total operating lease liabilities	$ 286	$ 1,241