Real Estate (Dispositions) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ 441		$ 460	$ 349	$ (370)
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	10		0	12	0
Gain (loss) on disposition of assets, discontinued operations	3,054		0	5,008	0
Income tax expense	0		0	(198)	0
Gain on disposition of real estate, net of income tax expense	3,054		0	4,810	0
Gain (Loss) on Disposition of Assets, Total, Continuing and Discontinued Operations	3,057		2,303	4,822	2,808
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		7	2	9
Gain (loss) on disposition of assets, discontinued operations	3	[1]	2,669	12	3,174
Income tax expense	$ 0		$ (366)	$ 0	$ (366)

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