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LEASES - Operating lease liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	$ 19,225
2021	19,129
2022	20,049
2023	16,641
2024	11,006
Later years	58,562
Discount	(29,028)
Total discounted operating lease liabilities	$ 115,584
Year ended December 31,
2019		$ 28,240
2020		25,331
2021		27,025
2022		28,012
2023		23,801
Later years		118,497
Total future minimum lease payments		$ 250,906

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