Discontinued Operations - Interest Expense Allocated to Discontinued Operations (Details) (Performance Fibers business [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Performance Fibers business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense allocated to the Performance Fibers business	$ (4,205)	$ (8,964)	$ (9,333)