Real Estate Investments and Properties Held for Sale - Schedule of Real Estate Properties (Details) $ in Thousands		9 Months Ended
	Sep. 30, 2016 USD ($) property	Sep. 30, 2016 USD ($) property
Other Real Estate [Roll Forward]
Beginning Balance, Number of properties (property)
Number of dispositions (property)	(3)
Ending Balance, Number of properties (property)	326	326
Beginning balance | $		$ 2,546,304
Ending balance | $	$ 2,458,281	$ 2,458,281
Properties acquired and sold
Other Real Estate [Roll Forward]
Beginning Balance, Number of properties (property)		329
Number of dispositions (property)		(3)
Ending Balance, Number of properties (property)	326	326
Beginning balance | $		$ 2,633,562
Base Purchase Price | $		(12,843)
Ending balance | $	$ 2,620,719	$ 2,620,719