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Combined Guarantor Subsidiaries - Leases - Right-of-Use Asset and Lease Liability Activity (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
ROU Asset  
Balance as of January 1, 2019 $ 4,160
Cash reduction (120)
Noncash increase 7
Balance as of March 31, 2019 4,047
Lease Liability  
Balance as of January 1, 2019 4,074
Cash reduction (120)
Noncash increase 70
Balance as of March 31, 2019 4,024
Guarantor Subsidiaries  
ROU Asset  
Balance as of January 1, 2019 493
Cash reduction (10)
Noncash increase 7
Balance as of March 31, 2019 490
Lease Liability  
Balance as of January 1, 2019 490
Cash reduction (10)
Noncash increase 10
Balance as of March 31, 2019 $ 490