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Borrowing Arrangements -2017 activity (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) property loan | Dec. 31, 2016 USD ($) property integer | Dec. 31, 2015 USD ($) property | Dec. 31, 2015 property loan | Dec. 31, 2015 property integer
Debt Instrument [Line Items] |  |  |  |  |
Number of loans | 3 |  |  | 4 | 2
Proceeds from issuance of secured debt | $ | $ 146,000 | $ 88,100 |  |  |
Mortgage notes payable financing proceeds | $ | $ 350,369 | $ 88,050 | $ 395,323 |  |
Stated interest rate (in percentage) | 4.07% |  |  |  |
Debt instrument, term (in years) | 20 years |  |  |  |
Number of pledged properties | 120 | 126 |  |  |
Number Of pledged properties, loans repaid | 15 |  |  |  |
Number of pledged properties, maturing loan | loan | 13 |  |  |  |
Repayments of debt | $ | $ 230,200 |  |  |  |
Penalty on prepayment | $ | $ 2,700 |  |  |  |
Interest rate at period end (in percentage) | 5.93% | 4.01% |  |  |
Old Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of pledged properties |  |  | 32 | 32 | 32
Repayments of debt | $ |  | $ 41,800 |  |  |
Interest rate at period end (in percentage) |  | 5.85% |  |  |
Fannie Mae |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (in percentage) | 3.97% |  |  |  |
Number of pledged properties | 5 |  |  |  |
Fannie Mae | Secured Debt | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | $ | $ 204,400 |  |  |  |
Manufactured homes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of pledged properties towards loans repaid |  | 4 |  |  |
Manufactured homes | Old Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of pledged properties |  |  | 1 | 1 | 1
Number of pledged properties towards loans repaid | 13 | 3 |  |  |
R V Resort |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of pledged properties towards loans repaid |  | 2 |  |  |
R V Resort | Old Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of pledged properties |  |  | 3 | 3 | 3
Number of pledged properties towards loans repaid | 2 | 2 |  |  |
Paradise Park Largo |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate (in percentage) | 4.60% |  |  |  |
Debt assumed for the purchase of property | $ | $ 5,900 |  |  |  |

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