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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) revenue_stream joint_venture | Dec. 31, 2016 joint_venture
Variable Interest Entity [Line Items] |  |  |
Number of joint ventures consolidated (in joint ventures) | joint_venture |  | 4 |
Number of revenue streams identified | revenue_stream |  | 3 |
Number of revenue streams with a change in accounting principle effective January 1, 2018 | revenue_stream |  | 2 |
Number of revenue streams with a change in accounting principle effective January 1, 2019 | revenue_stream |  | 1 |
Indirect leasing costs capitalized during period | $ | $ 1,700 | $ 3,200 |
Ground Lease |  |  |
Variable Interest Entity [Line Items] |  |  |
Future undiscounted minimum lease payments on ground leases | $ | $ 458,173 | $ 458,173 |
Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of joint ventures consolidated (in joint ventures) | joint_venture |  | 3 |
Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of joint ventures consolidated (in joint ventures) | joint_venture |  | 1 | 1

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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