Discontinued Operations and Business Realignment Costs - Restructuring Costs (Details) - Discontinued Operations, Disposed of by Means Other than Sale, Abandonment - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Compensation costs	$ 798
Contract termination costs	510	$ 0
Goodwill	4,105
Trademarks	771
Other	20
Business Exit Costs	$ 6,204