| **Real Estate Joint Ventures - Summarized Financial Information for Unconsolidated Investments (Details) - USD ($) $ in Thousands** | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 |
|-------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|---------------|
| **Investment In Unconsolidated Affiliates [Line Items]**                                                                            |          |          |          |          |
| Cash and cash equivalents                                                                                                           | $ 157,887     | $ 34,515      | $ 61,582      | $ 21,894      |
| Other assets                                                                                                                        | 32,647        | 31,990        |          |          |
| Total assets                                                                                                                        | 1,012,456     | 1,303,135     |          |          |
| Equity                                                                                                                              | 668,709       | 971,209       |          |          |
| Total liabilities and equity                                                                                                        | 1,012,456     | 1,303,135     |          |          |
| Other Affiliates                                                                                                                    |          |          |          |          |
| **Investment In Unconsolidated Affiliates [Line Items]**                                                                            |          |          |          |          |
| Cash and cash equivalents                                                                                                           | 14,362        | 15,461        |          |          |
| Other assets                                                                                                                        | 58            | 57            |          |          |
| Total assets                                                                                                                        | 14,420        | 15,518        |          |          |
| Accounts payable and other liabilities                                                                                              | 1,103         | 605           |          |          |
| Equity                                                                                                                              | 13,317        | 14,913        |          |          |
| Total liabilities and equity                                                                                                        | $ 14,420      | $ 15,518      |          |          |

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.
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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.
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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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