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Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Capitalized Interest Expense | Interest expense from continuing operations and interest capitalized to real estate assets related to development and major renovation activities for the three years ended December 31, 2015 were as follows (in thousands):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Total interest expense from continuing operations | $ | 60,204 |  |  | $ | 61,927 |  |  | $ | 64,809 |
Capitalized interest | 658 |  |  | 2,142 |  |  | 1,236 |
Interest expense from continuing operations, net of capitalized interest | $ | 59,546 |  |  | $ | 59,785 |  |  | $ | 63,573 |
Components of Fair Value of In-Place Leases [Table Text Block] | Amortization of these combined components from continuing operations during the three years ended December 31, 2015, 2014 and 2013 was as follows:
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Depreciation and amortization expense | $ | 22,244 |  |  | $ | 19,854 |  |  | $ | 17,923 |
Real estate rental revenue, net decrease (increase) | 538 |  |  | 456 |  |  | (633 | )
| $ | 22,782 |  |  | $ | 20,310 |  |  | $ | 17,290 |
Balances, net of accumulated depreciation or amortization, as appropriate, of the components of the fair value of in-place leases at December 31, 2015 and 2014 were as follows (in thousands):
| December 31,
| 2015 |  | 2014
| Gross Carrying Value |  | Accumulated Amortization |  | Net |  | Gross Carrying Value |  | Accumulated Amortization |  | Net
Tenant origination costs | $ | 55,664 |  |  | $ | 41,138 |  |  | $ | 14,526 |  |  | $ | 56,327 |  |  | $ | 35,463 |  |  | $ | 20,864 |
Leasing commissions/absorption costs | 97,678 |  |  | 75,014 |  |  | 22,664 |  |  | 93,729 |  |  | 60,289 |  |  | 33,440 |
Net lease intangible assets | 19,655 |  |  | 12,434 |  |  | 7,221 |  |  | 19,724 |  |  | 9,495 |  |  | 10,229 |
Net lease intangible liabilities | 34,027 |  |  | 23,444 |  |  | 10,583 |  |  | 34,027 |  |  | 20,974 |  |  | 13,053 |
Below-market ground lease intangible asset | 12,080 |  |  | 1,524 |  |  | 10,556 |  |  | 12,080 |  |  | 1,335 |  |  | 10,745 |
Components of Fair Value of In-Place Leases - Future Amortization [Table Text Block] | Amortization of these combined components from continuing operations over the next five years is projected to be as follows (in thousands):
| Depreciation and amortization expense |  | Real estate rental revenue, net decrease (increase) |  | Total
2016 | $ | 12,574 |  |  | $ | 372 |  |  | $ | 12,946 |
2017 | 8,860 |  |  | (185 | ) |  | 8,675 |
2018 | 6,078 |  |  | (668 | ) |  | 5,410 |
2019 | 3,572 |  |  | (530 | ) |  | 3,042 |
2020 | 2,349 |  |  | (321 | ) |  | 2,028 |

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