Variable Interest Entities (VIE) (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2014
Variable Interest Entity [Line Items]
Long-term Debt	$ 177,572			$ 182,606
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	$ 200	$ 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	$ 9,300			$ 9,400