Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2016

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)	2016		2015
Stock-based compensation expense	$	1,816	$	2,129