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Leases - Summary of Lease Cost and Cash Flow Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lease Cost    
Operating lease cost $ 3,151 $ 2,897
Short-term Lease, Cost 3,045 1,667
Finance Lease Cost:    
Amortization of leased assets 5,888,000 5,973,000
Finance Lease, Interest Expense 589,000 1,005,000
Total finance lease cost 6,477,000 6,978,000
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 6,401 4,871
Financing cash flows from finance leases $ 5,663,000 $ 5,901,000