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Significant Accounting Policies - Acquired Real Estate Leases and Amortization (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($)
Acquired real estate leases and amortization |  |  |
Number of acquisitions of properties with leases | item | 3 | 1 |
Acquired in-place and above market real estate leases |  |  |
Acquired real estate leases and amortization |  |  |
Amortization expense | $ 36,854,000 | $ 38,829,000 | $ 44,701,000
Estimated annual amortization for succeeding five years |  |  |
2017 | 36,139,000 |  |
2018 | 29,007,000 |  |
2019 | 21,006,000 |  |
2020 | 13,631,000 |  |
2020 | 8,962,000 |  |
2021 and thereafter | $ 16,834,000 |  |
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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