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Leases - Lease, costs (Details) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Lease, Cost [Abstract]        
Finance lease amortization expense $ 361   $ 720 $ 0
Finance lease interest expense 432 $ 0 871 0
Total finance lease cost 793   1,591  
Operating lease cost 4,079   6,886  
Total lease cost 4,872   8,477  
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash flows for finance leases 432   871  
Operating cash flows for operating leases 4,075   6,913  
Financing cash flows from finance leases $ 298   $ 590 0
Weighted average remaining lease term - finance leases 10 years 1 month 6 days   10 years 1 month 6 days  
Weighted average remaining lease term - operating leases 4 years 8 months 12 days   4 years 8 months 12 days  
Weighted average discount rate - finance leases 8.60%   8.60%  
Weighted average discount rate - operating leases 7.40%   7.40%  
Finance right-of-use assets obtained in exchange for lease obligations $ 0 0 $ 0 0
Operating right-of-use assets obtained in exchange for lease $ 183 $ 0 $ 205 $ 47,396