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Combined Guarantor Subsidiaries - Revenues - Contract Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Change in Contract with Customer, Liability [Roll Forward]    
Contract liability $ 265  
Completed performance obligation (4)  
Contract obligation 0  
Contract liability 261  
Contract with Customer, Liability [Abstract]    
Contract liability 265 $ 261
Expected Settlement Period    
2019   (99)
2020   (54)
2021   (54)
2022   (54)
Guarantor Subsidiaries    
Change in Contract with Customer, Liability [Roll Forward]    
Contract liability 79  
Completed performance obligation 0  
Contract obligation 0  
Contract liability 79  
Contract with Customer, Liability [Abstract]    
Contract liability $ 79 79
Expected Settlement Period    
2019   (19)
2020   (20)
2021   (20)
2022   $ (20)