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Real Estate Properties - Intangible Lease Assets and Obligations - (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Real Estate [Line Items] |  |  |
Acquired real rstate leases |  | $ 791,067 | $ 775,935
Acquired real estate lease obligations |  | 136,713 | 137,351
Accumulated amortization of capitalized below market lease values |  | 40,695 | 31,312
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
2018 |  | 55,898 |
2019 |  | 48,312 |
2020 |  | 39,921 |
2021 |  | 37,368 |
2022 |  | 34,809 |
Thereafter |  | $ 159,945 |
Weighted Average |  |  |
Real Estate [Line Items] |  |  |
Below market lease, remaining amortization period |  | 10 years 8 months 18 days |
Above market leases |  |  |
Real Estate [Line Items] |  |  |
Acquired real rstate leases |  | $ 40,540 | 43,906
Accumulated amortization |  | $ 29,900 | 28,739
Above market leases | Weighted Average |  |  |
Real Estate [Line Items] |  |  |
Finite-lived intangibles, remaining amortization period |  | 4 years 7 months 6 days |
In-place leases |  |  |
Real Estate [Line Items] |  |  |
Acquired real rstate leases |  | $ 750,527 | 732,029
Accumulated amortization |  | $ 288,902 | $ 232,750
In-place leases | Weighted Average |  |  |
Real Estate [Line Items] |  |  |
Finite-lived intangibles, remaining amortization period |  | 9 years 8 months 18 days |
MOBs | Ohio |  |  |
Real Estate [Line Items] |  |  |
Acquired lease amortization period | 14 years 1 month 6 days |  |

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