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Mortgage Notes Payable Schedule of Aggregate Principal Payments On Mortgage Notes (Tables) | 12 Months Ended
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Dec. 31, 2015
Mortgage Notes Payable [Abstract] |
Schedule of Aggregate Principal Payments On Mortgage Notes [Table Text Block] | Contractual aggregate principal payments of mortgage notes payable at December 31, 2015 are as follows:
| Principal Payments
| (in thousands)
2016 | $ | 576,864 |
2017 | 2,067,654 |
2018 | 18,633 |
2019 | 19,670 |
2020 | 20,766 |
Thereafter | 654,892 |
Total aggregate principal payments | 3,358,479 |
Unamortized balance of historical fair value adjustments | 80,235 |
Total carrying value of mortgage notes payable | $ | 3,438,714 |

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