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LEASES - Lease costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease cost:    
Operating lease expense $ 24,726 $ 27,549
Short-term lease expense 299 1,132
Sublease income (3,578) (1,144)
Total lease expense 21,447 27,537
Other information:    
Operating cash outflows from operating leases 20,452 25,004
Right-of-use assets obtained in exchange for new operating lease liabilities $ 36,742 $ 0
Weighted-average remaining lease term - operating leases 10 years 2 months 12 days 9 years
Weighted-average discount rate - operating lease 4.20% 4.70%