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 |
| X | ||||||||||
- Definition Additional depreciation expense recognized resulting from a change in the useful life of the disclosed asset. No definition available.
|
| X | ||||||||||
- Definition Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The cumulative amount of depreciation for real estate property held for investment purposes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Carrying amount of income producing properties held for rental. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|