Real Estate (Dispositions) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ 442	$ (93)
Assets Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number Of Disposed Properties Continuing Operations	6	2
Gain (loss) on disposition of assets, discontinued operations	7,230	1,954
Income tax expense	(30)	(198)
Gain on disposition of real estate, net of income tax expense	7,200	1,756
Gain (Loss) on Disposition of Assets, Total, Continuing and Discontinued Operations	7,200	1,765
Assets Held-for-sale | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of sold properties discontinued operations	0	2
Gain (loss) on disposition of assets, discontinued operations	$ 0	$ 9	[1]

[1] Amount includes deferred gain on previously sold properties.