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Leases and Commitments (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 23, 2015
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Lessee, Lease, Description [Line Items]          
Sale Leaseback Transaction, Net Proceeds, Investing Activities       $ 23,000,000  
Sale Leaseback Transaction, Annual Rental Payments       $ 2,275,000  
Sale Leaseback Transaction, Lease Terms       Each of the four lease agreements contains three 10-year renewals with the rent for each option term based on the greater of the then-current fair market rent for each property or the then- current rate and increasing annually by the applicable CPI. Under the terms of the lease agreements, the company is responsible for all taxes, insurance and utilities. The company is permitted to sublet the properties; however, the properties are currently being utilized exclusively by the company and there is no current subletting. The company is required to adequately maintain each of the properties and any leasehold improvements will be amortized over the lesser of the lives of the improvements or the remaining lease lives, consistent with any other company leases.  
Sale Leaseback Transaction, Deferred Gain, Gross $ 7,414,000        
Sale Leaseback Transaction, Immediate Loss Recognized 257,000        
Capital Lease Obligations $ 32,339,000        
Sale Leaseback Transaction, Current Period Gain Recognized   $ 74,000 $ 71,000 $ 220,000 $ 212,000
Minimum          
Lessee, Lease, Description [Line Items]          
General Lease Term       1 year  
Maximum          
Lessee, Lease, Description [Line Items]          
General Lease Term       20 years