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Borrowing Arrangements - 2015 Activity (Details) $ in Thousands | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) property loan | Dec. 31, 2016 USD ($) integer | Dec. 31, 2015 property | Dec. 31, 2015 USD ($) property | Dec. 31, 2015 property loan | Dec. 31, 2015 property integer | Dec. 31, 2016 USD ($) integer
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable financing proceeds | $ 350,369 | $ 88,050 |  | $ 395,323 |  |  |
Debt instrument, term (in years) | 20 years |  |  |  |  |  |
Weighted average interest rate (in percentage) | 4.80% |  |  |  |  |  |
Number of pledged properties | 120 | 126 |  |  |  |  | 126
Payments of debt extinguishment costs |  |  |  | 17,000 |  |  |
Number of loans | 3 |  |  |  | 4 | 2 |
Stated interest rate (in percentage) | 4.07% |  |  |  |  |  |
Mortgage debt assumed | $ 5,900 | $ 22,600 |  |  |  |  | $ 22,600
Net unamortized premiums | $ (3,253) |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (in percentage) | 3.10% |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (in percentage) | 8.90% |  |  |  |  |  |
New Credit Facilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Mortgage notes payable financing proceeds |  |  |  | $ 395,300 |  |  |
Debt instrument, term (in years) |  | 23 years | 21 years |  |  |  |
Weighted average interest rate (in percentage) |  |  | 3.93% | 3.93% | 3.93% | 3.93% |
Number of pledged properties | property |  |  | 26 | 26 | 26 | 26 |
Old Credit Facilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average interest rate (in percentage) |  |  | 5.58% | 5.58% | 5.58% | 5.58% |
Number of pledged properties | property |  |  | 32 | 32 | 32 | 32 |
Repayments of long-term debt |  |  |  | $ 48,700 |  |  | $ 370,200
Manufactured homes | Old Credit Facilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average interest rate (in percentage) |  |  | 5.73% | 5.73% | 5.73% | 5.73% |
Number of pledged properties | property |  |  | 1 | 1 | 1 | 1 |
R V Resort | Old Credit Facilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of pledged properties | property |  |  | 3 | 3 | 3 | 3 |

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