Real Estate (Dispositions) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ 372		$ 219		$ 721		$ (152)
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		22		0
Gain (loss) on disposition of assets, discontinued operations	3,464		0		8,472		0
Income tax expense	(108)		0		(306)		0
Gain on disposition of real estate, net of income tax expense	3,356		0		8,166		0
Gain (Loss) on Disposition of Assets, Total, Continuing and Discontinued Operations	3,499		812		8,321		3,620
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		22		2		31
Gain (loss) on disposition of assets, discontinued operations	143	[1]	1,228	[1]	155	[1]	4,402	[1]
Income tax expense	$ 0		$ (416)		$ 0		$ (782)

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