Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

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 September 30,				Nine months ended September 30,
(dollars in thousands)	2017		2016		2017		2016
Stock-based compensation expense	$	782	$	1,011	$	2,930	$	4,334