Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Investment Impairment (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accounting Policies [Abstract]
Impairment of Real Estate	$ 0	$ 0	$ 0	$ 0	$ 1,400,000