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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | [2] | Jun. 30, 2016 | [3] | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | [5] | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 09, 2015 | Dec. 04, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized | 20,000,000 |  |  |  |  | 20,000,000 |  |  |  |  | 20,000,000 | 20,000,000 |  |  |
Common Stock, Shares, Issued | 11,115,779 |  |  |  |  | 11,115,779 |  |  |  |  | 11,115,779 | 11,115,779 |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.01 |  |  |  |  | $ 0.01 |  |  |  |  | $ 0.01 | $ 0.01 |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0 | [1] | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 | [4] | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.12 | $ 0.16 | $ 0.13 |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  | 5,000 | 80,512 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  | $ 67 | $ 1,587 |  |  |
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  |  |  | $ 342 | $ 2,701 | $ 985 |  |
Stock Repurchase Program Expiration Date |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2017 |  |  |  |
Shares Paid for Tax Withholding for Share Based Compensation |  |  |  |  |  |  |  |  |  |  | 20,186 | 25,340 |  |  |
Adjustments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  |  |  | $ 275 | $ 1,114 |  |  |
Dividends, Common Stock, Cash |  |  |  |  |  |  |  |  |  |  | $ 1,244 | $ 1,656 | $ 1,345 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  | 20,000,000 |  |  |  |  |  | 20,000,000 | 20,000,000 |  |
Common Stock, Shares, Issued |  |  |  |  |  | 11,115,779 |  |  |  |  |  | 11,115,779 | 11,115,779 |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  |  | $ 0.01 |  |  |  |  |  | $ 0.01 |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  | 5,000 | 80,512 |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  | 5,000,000 |  |  |  |  |  | 5,000,000 |  |  |
Preferred Stock, Shares Issued | 0 |  |  |  |  | 0 |  |  |  |  | 0 | 0 |  |  |
Preferred Stock, No Par Value | $ 0.00 |  |  |  |  |  |  |  |  |  | $ 0.00 |  |  |  |
December 2013 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000
December 2015 Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000 |
[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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