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Debt - Mortgage Debt (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Repayment of mortgage notes payable |  | $ 266,613,000 | $ 346,615,000 | $ 32,305,000
Fixed rate mortgage debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate debt |  | 614,612,000 | 721,224,000 |
Fixed rate mortgage debt | 1333 Broadway |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate debt |  | $ 160,000,000 | $ 66,602,000 |
Face amount | $ 160,000,000.0 |  |  |
Fixed rate mortgage debt | 1400 Broadway |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of mortgage notes payable | $ 75,800,000 |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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