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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.

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