Variable Interest Entities (VIE) (Narrative) (Details) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Dec. 31, 2011 |
Dec. 31, 2009 |
Dec. 31, 2015 |
|
| Variable Interest Entity [Line Items] | ||||
| Long-term Debt | $ 146,747 | $ 147,537 | ||
| Payments to Acquire Businesses and Interest in Affiliates | $ 6,100 | $ 6,100 | ||
| VIE purpose | purchase the land and construct a 36-unit low income housing rental complex | |||
| Federal investment tax credits | $ 600 | $ 8,400 | ||
| Federal investment tax credit duration | 10 years | |||
| Variable Interest Entity, Not Primary Beneficiary [Member] | ||||
| Variable Interest Entity [Line Items] | ||||
| Long-term Debt | 41,700 | |||
| Equity Method Investments | 1,300 | |||
| Ownership in Liberty Mews Limited Partnership | 99.99% | |||
| VIE financing | $ 10,600 | |||
| Construction and Development Costs | $ 10,600 | |||
| Partnership total assets | $ 8,900 | $ 9,100 | ||