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LEASES - Operating lease liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Year ended December 31,    
Year One $ 22,817 $ 19,225
Year Two 23,598 19,129
Year Three 20,190 20,049
Year Four 14,478 16,641
Year Five 13,849 11,006
Later years 78,987 58,562
Discount (33,656) (29,028)
Total discounted operating lease liabilities $ 140,263 $ 115,584