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Fair Value Measurements - Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Document Fiscal Year Focus | 2016 |
Current Fiscal Year End Date | --12-31 |
Investments in real estate partnerships | $ 296,699 | $ 306,206
Provision for impairment | 1,700 |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities, Fair Value Disclosure | 28,588 | 29,093
Available-for-sale Securities | 7,420 | 7,922
Interest Rate Cash Flow Hedge Asset at Fair Value | 11,622 |
Total | 47,630 | 37,015
Interest Rate Cash Flow Hedge Liability at Fair Value | (580) | (20,539)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities, Fair Value Disclosure | 28,588 | 29,093
Available-for-sale Securities | 0 | 0
Interest Rate Cash Flow Hedge Asset at Fair Value | 0 |
Total | 28,588 | 29,093
Interest Rate Cash Flow Hedge Liability at Fair Value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities, Fair Value Disclosure | 0 | 0
Available-for-sale Securities | 7,420 | 7,922
Interest Rate Cash Flow Hedge Asset at Fair Value | 11,622 |
Total | 19,042 | 7,922
Interest Rate Cash Flow Hedge Liability at Fair Value | (580) | (20,539)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities, Fair Value Disclosure | 0 | 0
Available-for-sale Securities | 0 | 0
Interest Rate Cash Flow Hedge Asset at Fair Value | 0 |
Total | 0 | 0
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 0 | $ 0

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