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Related Party Transactions (Details) - Pacific Healthcare IPA - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Related Party Transaction [Line Items]      
Ownership percentage     50.00%
Provider Agreement with Pacific Healthcare IPA      
Related Party Transaction [Line Items]      
Payments under provider agreement $ 1 $ 1