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Real Estate Properties - Intangible Lease Assets and Obligations - (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Real Estate [Line Items] |  |
Acquired Real Estate Leases | $ 775,935 | $ 779,761
Intangible lease liabilities recorded | 137,351 | 139,346
Accumulated amortization of capitalized below market lease values | 31,312 | 23,819
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |
2017 | 64,832 |
2018 | 46,101 |
2019 | 39,599 |
2020 | 37,089 |
2021 | 34,813 |
Thereafter | $ 185,974 |
Weighted Average |  |
Real Estate [Line Items] |  |
Remaining amortization period on below market lease assets | 11 years 7 months 6 days |
Above market lease |  |
Real Estate [Line Items] |  |
Acquired Real Estate Leases | $ 43,906 | 48,048
Accumulated amortization | $ 28,739 | 26,828
Above market lease | Weighted Average |  |
Real Estate [Line Items] |  |
Finite-lived intangibles, remaining amortization period | 4 years 9 months 18 days |
Original value lease |  |
Real Estate [Line Items] |  |
Acquired Real Estate Leases | $ 732,029 | 731,713
Accumulated amortization | $ 232,750 | $ 148,647
Original value lease | Weighted Average |  |
Real Estate [Line Items] |  |
Finite-lived intangibles, remaining amortization period | 10 years 4 months 24 days |

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