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Debt - Mortgage Debt (Details) - USD ($) | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Repayment of mortgage notes payable |  | $ 264,771,000 | $ 342,703,000 |
Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt |  | 616,453,000 |  | $ 721,224,000
1333 Broadway | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate mortgage debt |  | $ 160,000,000 |  | $ 66,602,000
Face amount | $ 160,000,000.0 |  |  |
Stated rate (as a percent) | 4.21% | 4.21% |  |
1400 Broadway | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of mortgage notes payable | $ 75,800,000 |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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