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Summary of Significant Accounting Policies - Compensation Costs (Including Bonuses and Benefits) Capitalized (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Construction in Progress [Line Items] |  |  |
Salaries including bonuses and benefits, capitalized during the period | $ 6,717 | $ 7,291 | $ 5,194
Development [Member] |  |  |
Construction in Progress [Line Items] |  |  |
Salaries including bonuses and benefits, capitalized during the period | 3,182 | 2,641 | 1,749
Redevelopment [Member] |  |  |
Construction in Progress [Line Items] |  |  |
Salaries including bonuses and benefits, capitalized during the period | 144 | 221 | 184
Tenant Improvements [Member] |  |  |
Construction in Progress [Line Items] |  |  |
Salaries including bonuses and benefits, capitalized during the period | $ 3,391 | $ 4,429 | $ 3,261

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