Real Estate (Held for Sale) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) property	Dec. 31, 2015 USD ($) property
Real Estate [Abstract]
Number of properties classified as held for sale | property	20	25
Period for disposal of properties classified as held for sale	12 months
Number of properties sold | property	5
Land and improvements	$ 19,201	$ 27,946
Building and improvements	20,512	48,394
Real estate held-for-sale	39,713	76,340
Less accumulated depreciation and amortization	(5,703)	(9,486)
Less impairment	(4,776)	(2,003)
Real estate held for sale	$ 29,234	$ 64,851