Real Estate (Dispositions) (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015 USD ($) property	Jun. 30, 2014 USD ($) property		Jun. 30, 2015 USD ($) property	Jun. 30, 2014 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ (495)	$ 441		$ (54)	$ 349
Assets Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of sold properties - gain on disposition of real estate | property	3	10		9	12
Gain on disposition of real estate	$ 30	$ 3,054		$ 7,260	$ 5,008
Income tax expense	0	0		(30)	(198)
Gain on disposition of real estate, net of income tax expense	30	3,054		7,230	4,810
Gain on disposition of real estate included in discontinued operations, net of income tax expense	$ 30	$ 3,057		$ 7,230	$ 4,822
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 - gain on disposition of real estate included in discontinued operations | property	0	0		0	2
Gain on disposition of real estate	$ 0	$ 3	[1]	$ 0	$ 12	[1]

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