Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2009	Dec. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Long-term debt		$ 147,537	$ 182,606
Equity method investments		1,300
Partnership total assets		9,100	$ 9,400
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Long-term debt		41,700
Subsidiaries [Member]
Variable Interest Entity [Line Items]
Equity method investments	$ 6,100
Ownership in Liberty Mews Limited Partnership	99.99%
VIE financing	$ 10,600
Purchase of land for low income housing by Liberty Mews	$ 10,600
Federal investment tax credits		$ 8,400
Federal investment tax credit duration		10 years
Liberty Mews Limited Partnership [Member]
Variable Interest Entity [Line Items]
Ownership in Liberty Mews Limited Partnership		99.90%
Impact of tax credits on total tax expense		$ (600)