Real Estate (Dispositions) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 property properties	Mar. 31, 2013 property properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number Of Disposed Properties Continuing Operations	2	0
Number of sold properties discontinued operations	2	2
Gain (loss) on disposition of assets, discontinued operations	$ 1,954	$ 0
Income tax expense	(93)	(830)
Gain on disposition of real estate, net of income tax expense	1,756	0
Gain (Loss) on Disposition of Assets, Total, Continuing and Discontinued Operations	1,765	505
Assets Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition of assets, discontinued operations	9	505
Income tax expense	$ (198)	$ 0