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Acquisitions, Dispositions, Impairment, and Discontinued operations (Tables) | 12 Months Ended
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Dec. 31, 2016
Property, Plant and Equipment [Line Items] |
Disclosure of Long Lived Assets Held-for-sale [Table Text Block] | The operating properties, retail center, and land discussed above were classified as held for sale in the condensed consolidated balance sheet at December 31, 2015, and were made up of the following:
(in thousands) |  | December 31, 2015
Land |  | $ | 59,438 |
Buildings and improvements |  | 373,419 |
|  | $ | 432,857 |
Accumulated depreciation |  | (197,996 | )
Net operating real estate assets |  | $ | 234,861 |
Properties under development, including land |  | 4,202 |
Discontinued operations held for sale, including land |  | $ | 239,063 |
Other assets related to properties held for sale |  | 1,191 |
Total assets held for sale |  | $ | 240,254 |
Liabilities related to assets held for sale |  | $ | 1,654 |
Disposal Groups, Including Discontinued Operations [Table Text Block] | The following is a summary of income from discontinued operations for the years ended December 31, 2016, 2015, and 2014 relating to the 15 operating properties and the retail center sold in April 2016:
|  | Years Ended December 31,
(in thousands) |  | 2016 |  | 2015 |  | 2014
Property revenues |  | $ | 19,184 |  |  | $ | 57,310 |  |  | $ | 53,715 |
Property expenses |  | (6,898 | ) |  | (20,716 | ) |  | (19,608 | )
|  | $ | 12,286 |  |  | $ | 36,594 |  |  | $ | 34,107 |
Property management expense |  | (242 | ) |  | (706 | ) |  | (619 | )
Depreciation and amortization |  | (4,327 | ) |  | (16,138 | ) |  | (15,291 | )
Income tax expense |  | (112) |  | — |  |  | — |
Income from discontinued operations |  | $ | 7,605 |  |  | $ | 19,750 |  |  | $ | 18,197 |
Gain on sale of discontinued operations, net of tax |  | $ | 375,237 |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of long lived assets held for sale. Disclosure may include the description of the facts and circumstances leading to the expected disposal, manner and timing of disposal, the carrying value of the assets held for sale, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230 + Details
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- Definition Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721665-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1474-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=64862545&loc=SL51724579-110230 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721663-107760 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721659-107760 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721671-107760 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5D -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760 + Details
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