Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

Stock-based compensation expense charged to the Condensed Consolidated Statements of Operations is as follows:

	Three months ended March 31,
(dollars in thousands)	2018		2017
Stock-based compensation expense	$	290	$	832

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

The effect of the retrospective presentation change related to the net periodic pension and non-pension benefit costs (credits) on our Condensed Consolidated Statement of Operations was as follows:

	Three months ended March 31, 2017
(dollars in thousands)	Previously Reported			Reclassification			As Revised
Cost of sales	$	143,356		$	(883	)	$	142,473
Selling, general and administrative expenses	32,975			357			33,332
Other income (expense)	(2,260		)	(526		)	(2,786		)