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Discontinued Operations and Divestitures - Lithia (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Jul. 03, 2017
Dec. 31, 2017
Oct. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of business, net       $ 43,753,000 $ 96,066,000
Litha Healthcare Group Limited | Disposal Group, Held-for-sale, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of business, net $ 94,200,000        
Consideration receivable     $ 4,400,000    
Gain on sale of business $ 0 $ 10,100,000