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Fair Value Disclosures - Financial Assets and Liabilities Not Measured at Fair Value (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
|
Sep. 30, 2013
Carrying Value
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Dec. 31, 2012
Carrying Value
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Sep. 30, 2013
Carrying Value
2445 M Street Note Receivable [Member]
|
Dec. 31, 2012
Carrying Value
2445 M Street Note Receivable [Member]
|
Sep. 30, 2013
Fair Value
|
Dec. 31, 2012
Fair Value
|
Sep. 30, 2013
Fair Value
2445 M Street Note Receivable [Member]
|
Dec. 31, 2012
Fair Value
2445 M Street Note Receivable [Member]
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||
| Commercial paper, maturity | 90 | ||||||||
| Cash and cash equivalents, Fair Value | $ 7,923 | $ 19,324 | $ 7,923 | $ 19,324 | |||||
| Restricted Cash, Fair Value | 7,674 | 14,582 | 7,674 | 14,582 | |||||
| 2445 M Street note receivable, Fair Value | 6,166 | 6,617 | 6,990 | 6,654 | |||||
| Mortgage notes payable, Fair Value | 314,305 | 342,970 | 337,266 | 374,591 | |||||
| Lines of credit payable, Fair Value | 85,000 | 0 | 85,000 | 0 | |||||
| Notes payable, Fair Value | $ 846,576 | $ 906,190 | $ 873,702 | $ 968,040 |