Real Estate Investments - Long Lived Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Long Lived Assets Held-for-sale [Line Items]
Depreciation and amortization	$ 9,881	$ 9,200
Long-lived assets held-for-sale	4,028		0
Land [Member]
Long Lived Assets Held-for-sale [Line Items]
Long lived assets	1,595
Building and Building Improvements [Member]
Long Lived Assets Held-for-sale [Line Items]
Depreciation and amortization	20
Long lived assets	3,099
Less: accumulated depreciation and amortization	666
Land, Buildings and Improvements [Member]
Long Lived Assets Held-for-sale [Line Items]
Long lived assets	$ 4,694