Restructuring (Restructuring Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 722	$ 0	$ 2,806	$ 2,315
Severance and other associated costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	722		2,806	399
Restructuring costs		(31)
Wind down cost legacy platform
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0		$ 0	$ 1,916
Restructuring costs		$ 31