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Significant Accounting Policies - Acquired Real Estate Leases and Amortization (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) item
Acquired real estate leases and amortization |  |  |
Number of acquisitions of properties with leases | item | 1 |  | 3
Amortization expense | $ (158,000) | $ 635,000 | $ (365,000)
Acquired in-place and above market real estate leases |  |  |
Acquired real estate leases and amortization |  |  |
Amortization expense | 38,829,000 | $ 44,701,000 | $ 32,230,000
Estimated annual amortization for succeeding five years |  |  |
2016 | 32,302,000 |  |
2017 | 25,233,000 |  |
2018 | 19,624,000 |  |
2019 | 12,887,000 |  |
2020 | 7,659,000 |  |
2021 and thereafter | $ 10,341,000 |  |
Acquired in-place and above market real estate leases | Minimum |  |  |
Acquired real estate leases and amortization |  |  |
Term of lease | 3 months |  |
Acquired in-place and above market real estate leases | Maximum |  |  |
Acquired real estate leases and amortization |  |  |
Term of lease | 281 months |  |

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