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Acquisitions and Dispositions - RJ JV Acquisition 2 (Details 4)		12 Months Ended
	Jun. 14, 2013 USD ($) shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Business Acquisition [Line Items]
Gain on remeasurement of equity method investment		$ 0	$ 0	$ 10,945,000
Formation of consolidated joint venture				$ 500,000
RJ Joint Ventures Acquisition
Business Acquisition [Line Items]
Fair value of existing Class B interest	$ 7,615,000
Carrying value of Class B interest	(3,330,000)
Gain on remeasurement of equity method investment	$ 10,945,000
AH LLC | Class A common shares
Business Acquisition [Line Items]
Preferred units, units converted to common shares | shares	653,492
Fair value of convertible securities	$ 10,500,000
Formation of consolidated joint venture	11,300,000
Carrying value of preferred units	$ 0
Conversion ratio	1

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