Restructuring (Restructuring Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 178	$ 240
Severance and other associated costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	178	110
Wind down cost legacy platform [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0	$ 130