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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Document Fiscal Year Focus | 2016 |
COMBINED ABOVE-Notes receivable (note 5) | $ 10,481 | $ 10,480
Unsecured Credit Facilities [Member] | Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Assumptions, Risk Free Interest Rate | 1.50% | 1.10%
Unsecured Credit Facilities [Member] | Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Assumptions, Risk Free Interest Rate | 1.60% | 1.10%
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes Receivable, Fair Value | $ 10,380 | $ 10,620
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes Payable, Fair Value | 1,435,000 | 1,793,200
Fair Value, Inputs, Level 2 [Member] | Unsecured Credit Facilities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt Instrument, Fair Value Disclosure | $ 279,700 | $ 165,300
Notes Receivable [Member] | Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Assumptions, Risk Free Interest Rate | 7.20% | 6.30%
Notes Receivable [Member] | Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Assumptions, Risk Free Interest Rate | 7.20% | 6.30%
Notes Payable, Other Payables [Member] | Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Assumptions, Risk Free Interest Rate | 2.90% | 2.80%
Notes Payable, Other Payables [Member] | Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Assumptions, Risk Free Interest Rate | 3.90% | 4.20%
Partnership Interest [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
COMBINED ABOVE-Notes receivable (note 5) | $ 10,481 | $ 10,480
Notes Payable | 1,363,925 | 1,699,771
Unsecured Debt | $ 278,495 | $ 164,514

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