Acquisitions and Developments - Other Acquisitions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 Entity	Dec. 31, 2014 USD ($) Practice
Business Acquisition [Line Items]
Number of business entities acquired | Entity	1
Physician Practice
Business Acquisition [Line Items]
Number of business entities acquired | Practice		3
Aggregate purchase price | $		$ 1.6