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Properties, net (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2015 | Dec. 31, 2014
Investments in real estate |  |  |
Operating properties, net |  | $ 2,896,809 | $ 2,751,488
Greater Philadelphia |  |  |
Investments in real estate |  |  |
Depreciation expense on reclassified assets | $ 12,900 |  |
Operating properties, net |  |  |
Investments in real estate |  |  |
Less: accumulated depreciation |  | (723,470) | (703,083)
Operating properties, net | Land |  |  |
Investments in real estate |  |  |
Gross |  | 460,268 | 439,355
Operating properties, net | Buildings and improvements |  |  |
Investments in real estate |  |  |
Gross |  | $ 3,160,011 | $ 3,015,216

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- Definition Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 + Details
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- Definition Carrying amount of income producing properties held for rental. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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