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Fair Value of Financial Instruments Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2013
Fair Value Disclosures [Abstract] |
Schedule Of Financial Instruments With Fair Values Different From Their Carrying Amount [Table Text Block] | The following are financial instruments for which the Company’s estimates of fair value differ from the carrying amounts (in thousands):
| June 30, 2013 |  | December 31, 2012
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Mortgage notes payable | $ | 438,404 |  |  | $ | 474,036 |  |  | $ | 443,942 |  |  | $ | 486,412 |
Unsecured notes payable | $ | 1,418,548 |  |  | $ | 1,495,998 |  |  | $ | 1,430,343 |  |  | $ | 1,553,123 |
Variable rate debt | $ | 528,610 |  |  | $ | 526,693 |  |  | $ | 597,610 |  |  | $ | 595,693 |
Notes receivable | $ | 7,026 |  |  | $ | 7,080 |  |  | $ | 7,226 |  |  | $ | 7,783 |

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