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LEASES - Lease costs (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Lease cost:  
Operating lease expense $ 27,549
Short-term lease expense 1,132
Sublease income (1,144)
Total lease expense 27,537
Other information:  
Operating cash outflows from operating leases 25,004
Right-of-use assets obtained in exchange for new operating lease liabilities $ 0
Weighted-average remaining lease term - operating leases 9 years
Weighted-average discount rate - operating lease 4.70%