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Dispositions (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Document Fiscal Year Focus |  | 2016 |  |
Investments in real estate partnerships (note 4) |  | $ 296,699 | $ 306,206 |
Proceeds from sale of real estate investments |  | 137,479 | 108,822 | $ 118,787
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes |  | 47,321 | 35,606 | 55,077
Provision for impairment |  | 1,700 |  |
Revenues included in Discontinued Operations | $ 149,628 |  |  |
Parent Company [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Investments in real estate partnerships (note 4) |  | 296,699 | 306,206 |
Proceeds from sale of real estate investments |  | 135,269 | 108,822 | 118,787
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes |  | 47,321 | 35,606 | 55,077
Provision for impairment |  | 4,200 | 0 | 1,257
Revenues included in Discontinued Operations |  | 614,371 | 569,763 | 537,898
Operating Expenses |  | $ 403,152 | $ 365,098 | $ 353,348
Operating Segments [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of Real Estate Properties Sold | property |  | 11 | 5 | 11
Land [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of Real Estate Properties Sold | property |  | 16 | 2 | 6

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