Consolidated and Basis of Presentation of Financial Statements (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2016 USD ($) investment	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of equity method investments sold | investment	1
Gain on sale of investment in unconsolidated affiliate		$ 733	$ 0
Unnamed pharmacy joint venture
Schedule of Equity Method Investments [Line Items]
Gain on sale of investment in unconsolidated affiliate	$ 1,366	$ 733