Acquisitions (Pro Forma Income Statements) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended													12 Months Ended
	Dec. 31, 2016	[1]	Sep. 30, 2016	[2]	Jun. 30, 2016	[3]	Mar. 31, 2016	Dec. 31, 2015	[4]	Sep. 30, 2015	[5]	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Diluted (loss) earnings per share As Reported	$ (3.97)		$ (0.58)		$ (8.96)		$ (0.28)	$ 0.32		$ (5.60)		$ 0.52	$ 0.41	$ (13.79)	$ (4.33)	$ 2.48
Pro Forma [Member]
Business Acquisition [Line Items]
Net sales															$ 640,596	$ 806,384
Gross profit															138,123	183,163
Net (loss) income															$ (44,399)	$ 41,745
Dilutive (loss) earnings per share Pro forma															$ (4.32)	$ 4.04

[1] Fourth quarter 2016 includes deferred U.S. income taxes and foreign withholding taxes of $7,932 on unremitted foreign earnings and a valuation allowance of $29,719 against deferred tax assets.

[2] Third quarter 2016 includes $6,946

[3] Second quarter 2016 includes $128,938 impairment of assets related to the Chemtec, Protective Coatings, IOS and Rail Technologies product groups.

[4] Fourth quarter 2015 includes $2,279 pre-tax gain on sale of Tucson, AZ concrete tie facility.

[5] Third quarter 2015 includes $80,337 impairment of goodwill related to the IOS and Chemtec reporting units.