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LEASES - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Leases [Abstract]          
Operating lease, cost $ 5,350 $ 2,988 $ 13,911 $ 11,063  
Finance lease cost          
Amortization of leased assets 291 244 929 732  
Interest on lease liabilities 39 90 141 210  
Short-term lease cost 4,821 4,777 15,945 14,183  
Variable lease costs (costs excluded from minimum fixed lease payments)** 697 1,727 1,969 2,932 $ 1,000
Sublease income (307) 0 (871) 0  
Net lease cost $ 10,891 9,826 32,024 29,120  
Accelerated amortization   600 $ 100 3,500  
Variable lease cost accrued   $ 900   $ 1,000