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Discontinued Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale of properties $ 11,410 $ 2,304 $ 11,410 $ 8,605
Income tax expense (benefit) 0 (671) 0 (608)
Segment, Discontinued Operations [Member]
        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net proceeds 82,634 17,600 82,634 39,200
Number of properties sold 4 2 4 4
Revenues 1,584 3,295 3,976 7,137
Operating expenses 615 2,173 2,025 4,723
Impairment of Real Estate 0 4,500 0 4,500
Income tax expense (benefit) 0 49 0 (13)
Operating income from discontinued operations 969 (3,427) 1,951 (2,073)
Segment, Discontinued Operations [Member] | Wholly Owned Properties [Member]
        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Percent interest sold 100.00% 100.00% 100.00% 100.00%
Partnership Interest [Member]
        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale of real estate 1,717 (21) 1,717 1,814
Gain on sale of properties 11,410 2,304 11,410 8,605
Revenues 125,842 126,765 249,558 250,627
Operating expenses 80,662 78,088 163,342 160,009
Impairment of Real Estate 0 19,008 0 19,008
Operating income from discontinued operations 969 (3,427) 1,951 (2,073)
Parent Company [Member]
        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale of real estate 1,717 (21) 1,717 1,814
Gain on sale of properties 11,410 2,304 11,410 8,605
Revenues 125,842 126,765 249,558 250,627
Operating expenses 80,662 78,088 163,342 160,009
Impairment of Real Estate 0 19,008 0 19,008
Operating income from discontinued operations $ 969 $ (3,427) $ 1,951 $ (2,073)