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Finance and Operating Leases (Details) - USD ($)
Jun. 30, 2020
Apr. 30, 2020
Mar. 31, 2020
Jan. 27, 2020
Jul. 01, 2019
Jun. 30, 2019
Feb. 28, 2019
Finance and Operating Leases              
Finance lease liability $ 17,938,000         $ 24,600,000  
Finance lease right-of-use assets 19,800,000         $ 19,800,000  
Purchase option $ 1            
Incremental borrowing rate used as discount rate       2.55% 3.86%    
Minimum              
Finance and Operating Leases              
Interest rate on finance lease (as a percent) 1.52%            
Finance lease term 1 year            
Maximum              
Finance and Operating Leases              
Interest rate on finance lease (as a percent) 3.87%            
Finance lease term 3 years            
PNC              
Finance and Operating Leases              
Finance lease term 36 months            
Purchase option $ 1            
BALC              
Finance and Operating Leases              
Available line of credit   $ 25,000,000.0         $ 25,000,000.0
Finance lease term 12 years           36 months
Purchase option     $ 1        
BALC | Minimum              
Finance and Operating Leases              
Fixed interest rate (as a percent)             1.52%
BALC | Maximum              
Finance and Operating Leases              
Fixed interest rate (as a percent)             3.58%