Annual report pursuant to Section 13 and 15(d)

LEASES - Additional Information (Details)

v3.20.4
LEASES - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Finance lease renewal term (in years) 40 years    
Finance lease, termination term (in years) 5 years    
Finance lease, weighted-average remaining lease term (in years) 50 years    
Finance lease, weighted-average discount rate (as a percentage) 13.00%    
Finance lease, right-of-use asset $ 20,018 $ 13,437  
Finance lease, liability 13,509    
Finance lease costs (1,700) (200)  
Finance lease costs, paid 1,100    
Finance lease, principal and interest payments $ 2,900 2,200  
Operating lease renewal term (in years) 10 years    
Operating lease, weighted-average remaining lease term (in years) 6 years    
Operating lease, weighted-average discount rate (as a percentage) 8.00%    
Operating lease liability $ 13,656    
Operating lease, right of use asset 11,884 15,832  
Operating lease costs 2,700 3,600 $ 3,200
Operating lease, cash paid for amounts included in the measurement of lease liabilities $ 2,800 $ 3,200 $ 2,200
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent    
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent    
Accrued and other liabilities      
Lessee, Lease, Description [Line Items]      
Operating lease liability $ 1,900    
Other non-current liabilities      
Lessee, Lease, Description [Line Items]      
Operating lease liability $ 11,800