Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2016

Accounts, Notes, Loans and Financing Receivable [Line Items]

Schedule Of Accounts Receivable, Net [Table Text Block]

		2016		2015
Trade	$	64,707	$	79,100
Allowance for doubtful accounts		(1,417)		(1,485)
		63,290		77,615
Other		3,342		872
	$	66,632	$	78,487

Operating Segments [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Schedule Of Accounts Receivable, Net [Table Text Block]

		2016		2015
Rail Products and Services	$	29,552	$	43,155
Construction Products		20,531		20,489
Tubular and Energy Services		13,207		13,971
	$	63,290	$	77,615