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Combined Guarantor Subsidiaries - Leases - Right-of-Use Asset and Lease Liability Activity (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
ROU Asset  
Balance at beginning of period $ 4,160,000
Cash reduction (557,000)
Noncash increase 201,000
Balance at end of period 3,804,000
Lease Liability  
Balance at beginning of period 4,074,000
Cash reduction (557,000)
Noncash increase 320,000
Balance at end of period 3,837,000
Guarantor Subsidiaries  
ROU Asset  
Balance at beginning of period 493,000
Cash reduction (10,000)
Noncash increase 6,000
Balance at end of period 489,000
Lease Liability  
Balance at beginning of period 490,000
Cash reduction (10,000)
Noncash increase 9,000
Balance at end of period $ 489,000