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Fair Value Measurement - Assets and Liabilities on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Oct. 01, 2018
Recurring      
Assets      
Cash and cash equivalents $ 9,139 $ 11,391  
Restricted cash and restricted investments 34,774 31,226  
Total 43,913 42,617  
Liabilities      
Contingent consideration, liability 8,100 8,800  
Recurring | Level 1      
Assets      
Cash and cash equivalents 9,139 11,391  
Restricted cash and restricted investments 34,774 31,226  
Total 43,913 42,617  
Liabilities      
Contingent consideration, liability 0 0  
Recurring | Level 2      
Assets      
Cash and cash equivalents 0 0  
Restricted cash and restricted investments 0 0  
Total 0 0  
Liabilities      
Contingent consideration, liability 0 0  
Recurring | Level 3      
Assets      
Cash and cash equivalents 0 0  
Restricted cash and restricted investments 0 0  
Total 0 0  
Liabilities      
Contingent consideration, liability 8,100 8,800  
Passport | Recurring      
Liabilities      
Contingent consideration, liability 4,900 5,600  
New Century Health      
Liabilities      
Contingent consideration arrangements (up to)     $ 20,000
New Century Health | Recurring      
Liabilities      
Contingent consideration, liability $ 3,200 $ 3,200  
Class B | New Century Health      
Liabilities      
Contingent consideration arrangements (up to)     $ 11,400