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Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2017
Apr. 13, 2017
Apr. 13, 2016
May 31, 2007
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction              
Interest income         $ 29 $ 10  
Contribution from Parent         1,900    
Parent Issuer UHS              
Related Party Transaction              
Contribution from Parent         1,900    
IPC | General Advisory And Management Services              
Related Party Transaction              
Amount incurred         1,000 1,000 $ 1,000
IPC | General Advisory And Management Services | Minimum              
Related Party Transaction              
Specified amount of annual fees for ongoing advisory and management services       $ 500      
Annual fee for ongoing advisory and management services as a percentage of adjusted EBITDA       0.75%      
Executive Officer | Promissory Note Agreement              
Related Party Transaction              
Interest income         $ 30 $ 10  
Executive Officer | Promissory Note Agreement | Other Noncurrent Assets              
Related Party Transaction              
Note receivable   $ 900 $ 1,000        
Executive Officer | Promissory Note Agreement | Minimum              
Related Party Transaction              
Interest rate     1.45%        
Executive Officer | Promissory Note Agreement | Maximum              
Related Party Transaction              
Interest rate   2.12%          
Executive Officer | Parent Issuer UHS              
Related Party Transaction              
Unregistered shares sold by Parent 1,596,640            
Contribution from Parent $ 1,900