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Lease Agreements - Lease-related assets and liabilities (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
ASSETS  
Operating lease assets $ 29,423
Finance lease assets 10,293
Total lease assets 39,716
Current  
Operating 6,537
Finance 596
Noncurrent  
Operating 22,760
Finance 8,208
Total liabilities $ 38,101
Weighted average remaining lease term (years)  
Operating leases 5 years 6 months
Finance leases 10 years 10 months 24 days
Weighted average discount rate  
Operating leases 5.20%
Finance leases 4.70%