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Summary of Significant Accounting Policies - Properties in Development (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |
Current Fiscal Year End Date | --12-31 |  |
Document Fiscal Year Focus | 2016 |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | $ 522,490 |  |
Other Cost and Expense, Operating | 1,500 | $ 1,700 | $ 2,300
Impairment of Real Estate | 1,700 |  |
Impairment Losses Related to Real Estate Partnerships | (1,300) | (1,300) |
Refundable deposits - development |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | $ 1,200 | $ 1,300 |

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- Definition Impairment losses measured as the amount by which the carrying amount of the business or real estate partnerships exceeds the fair value of the business or partnership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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