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Summary of Significant Accounting Policies - Deferred Financing Fees (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) item | Oct. 31, 2014 USD ($) item | Dec. 31, 2015 USD ($) property item | Dec. 31, 2014 USD ($) | Nov. 30, 2015 | Sep. 30, 2015 USD ($) | May. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2013 USD ($)
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |
Number of properties acquired encumbering with assumed mortgage debt | property |  |  | 9 |  |  |  |  |  |
Principal amount of debt | $ 1,750,000 |  | $ 1,500,000 | $ 1,750,000 |  |  |  |  |
Deferred financing fees and unamortized discounts written off |  |  | 70 |  |  |  |  |  |
Repayments of borrowings under revolving credit facility |  |  | 250,000 |  |  |  |  |  |
Interest rate (as a percent) |  | 5.875% |  |  |  |  |  |  |
Unamortized gross balance of deferred financing fees | 22,782 |  | 50,477 | 22,782 |  |  |  |  |
Accumulated amortization related to deferred financing fees | 19,930 |  | $ 50,479 | 19,930 |  |  |  |  |
Weighted average amortization period of deferred financing fees |  |  | 12 years 6 months |  |  |  |  |  |
Amortization of deferred financing fees |  |  |  |  |  |  |  |  |
Amortization expense in 2016 |  |  | $ 5,514 |  |  |  |  |  |
Amortization expense in 2017 |  |  | 5,247 |  |  |  |  |  |
Amortization expense in 2018 |  |  | 3,394 |  |  |  |  |  |
Amortization expense in 2019 |  |  | 2,639 |  |  |  |  |  |
Amortization expense in 2020 |  |  | 1,213 |  |  |  |  |  |
Amortization expense thereafter |  |  | 9,688 |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |
Issuance costs capitalized |  |  | 2,952 |  |  | $ 1,200 |  | $ 3,326 | $ 248
Term Loan |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |
Issuance costs capitalized |  |  | 1,752 |  |  |  |  |  |
Principal amount of debt |  |  |  |  |  | 200,000 |  |  |
Term Loan Due In May 2014 |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |
Issuance costs capitalized |  |  |  |  |  |  | $ 2,819 |  |
Principal amount of debt |  |  |  |  |  |  | 350,000 |  |
Senior unsecured notes 4.30% |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |
Principal amount of debt | 250,000 |  |  | 250,000 |  |  |  |  |
Repayments of borrowings under revolving credit facility |  |  | $ 250,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.30% |  | 4.30% |  |  |  |
Senior unsecured notes 6.75% |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |
Principal amount of debt | $ 200,000 |  | $ 200,000 | 200,000 |  |  |  |  |
Interest rate (as a percent) |  |  | 6.75% |  |  |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |
Issuance costs capitalized |  |  |  |  |  |  |  |  | $ 3,078
Mortgages |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |
Issuance costs capitalized |  |  |  |  |  |  | 199 |  |
Number of senior notes repaid | item | 2 | 2 | 10 |  |  |  |  |  |
Principal amount of debt |  |  | $ 82,569 |  |  |  |  |  |
Early repayment of debt variable portion |  | $ 23,234 |  | 23,234 |  |  |  |  |
Deferred financing fees and unamortized discounts written off |  |  | 74 | $ 357 |  |  |  |  |
Interest rate (as a percent) | 6.37% | 6.25% |  | 6.37% |  |  |  |  |
Senior notes issued in April 2014 |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |
Issuance costs capitalized |  |  | 8,039 |  |  | $ 5,021 |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |
DEFERRED FINANCING FEES |  |  |  |  |  |  |  |  |
Principal amount of debt |  |  | $ 350,000 |  |  |  | $ 350,000 |  |

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