Discontinued Operations (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	$ 84,135
Proceeds from Divestiture of Interest in Consolidated Subsidiaries	81,140
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	39,491
Gregory Mountain Products, Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	84,135
Discontinued Operation, Transaction Fees	2,995
Proceeds from Divestiture of Interest in Consolidated Subsidiaries	81,140
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	39,491
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation	19,424
Interest expense allocated to discontinued operations	$ 635	$ 1,008	$ 495