Restructuring and Other Charges (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) Employee	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) Employee
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 23	$ 1,061	$ 801	$ 2,318
Business Combination, Integration Related Costs	1,107	226	2,999	439
Restructuring and Business Combination Related Expenses, Facility Reductions	0	57	190	57
Restructuring and acquisition-related charges, net	$ 1,130	$ 1,344	$ 3,990	$ 2,814
Restructuring and Related Cost, Number of Positions Eliminated | Employee		57		87
Other Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 1,000