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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) property | Mar. 31, 2019 USD ($) segment $ / € | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 $ / £ | Dec. 31, 2018 $ / € | Dec. 31, 2018 USD ($) | Dec. 31, 2018 $ / £ | Dec. 31, 2018 £ / $ | Dec. 31, 2018 € / $
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average remaining lease term |  | 8 years 1 month |  |  |  |  |  |  |  |
Foreign currency exchange rate, tanslation |  | 1.12 |  |  | 1.30 | 1.14 |  | 1.27 | 1.27 | 1.14
Uncollectable Lease Receivables |  | $ 100 | $ 100 |  |  |  |  |  |  |
Number of reportable segments (segment) | segment |  | 1 |  |  |  |  |  |  |  |
Number of ground leases | property | 7 |  |  |  |  |  |  |  |  |
Right-of-use asset |  |  |  | $ 50,800 |  |  |  |  |  |
Operating lease, liability |  |  |  | 23,717 |  |  |  |  |  |
Accumulated deficit |  |  |  | $ (653,956) |  |  | $ (615,448) |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Lease-up period |  | 12 months |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Lease-up period |  | 18 months |  |  |  |  |  |  |  |
2015 OPP |  |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Requisite service period |  | 2 years 9 months 12 days |  |  |  |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Accounts receivable | $ 3,400 |  |  |  |  |  |  |  |  |
Bad debt reserve | 2,200 |  |  |  |  |  |  |  |  |
Right-of-use asset | 24,000 |  |  |  |  |  |  |  |  |
Operating lease, liability | 24,000 |  |  |  |  |  |  |  |  |
Ground lease intangible | 27,000 |  |  |  |  |  |  |  |  |
Accounting Standards Update 2017-12 |  |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ 300 |  |  |  |  |  |  |  |  |

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