Earning Per Common Share (Schedule of Earnings Per Share, Basic and Diluted) (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
Earnings Per Common Share [Abstract]
Net (loss) income	$ (40,851)		$ (5,982)		$ (91,996)		$ (2,832)	$ 3,328		$ (57,422)		$ 5,362	$ 4,285	$ (141,660)	$ (44,445)	$ 25,656
Weighted average shares outstanding														10,273,000	10,254,000	10,225,000
Denominator for basic earnings per common share														10,273,000	10,254,000	10,225,000
Employee stock options														0		6,000
Other stock compensation plans														0		101,000
Dilutive potential common shares														0		107,000
Denominator for diluted earnings per common share - adjusted weighted average shares and assumed conversions														10,273,000	10,254,000	10,332,000
Basic (loss) earnings per common share	$ (3.97)		$ (0.58)		$ (8.96)		$ (0.28)	$ 0.33		$ (5.60)		$ 0.52	$ 0.42	$ (13.79)	$ (4.33)	$ 2.51
Diluted (loss) earnings per common share	(3.97)		(0.58)		(8.96)		(0.28)	0.32		(5.60)		0.52	0.41	(13.79)	(4.33)	2.48
Dividends paid per common share	$ 0		$ 0.04		$ 0.04		$ 0.04	$ 0.04		$ 0.04		$ 0.04	$ 0.04	$ 0.12	$ 0.16	$ 0.13
Antidilutive shares excluded from computation of earnings per share														143	130	0

[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.