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Combined Guarantor Subsidiaries - Leases - Right-of-Use Asset and Lease Liability Activity (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
ROU Asset  
Balance at beginning of period $ 4,160
Cash reduction (242)
Noncash increase 127
Balance at end of period 4,045
Lease Liability  
Balance at beginning of period 4,074
Cash reduction (242)
Noncash increase 210
Balance at end of period 4,042
Guarantor Subsidiaries  
ROU Asset  
Balance at beginning of period 493
Cash reduction (20)
Noncash increase 16
Balance at end of period 489
Lease Liability  
Balance at beginning of period 490
Cash reduction (20)
Noncash increase 19
Balance at end of period $ 489