Restructuring and Other Charges (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($) Employee	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($) Employee	Jun. 30, 2018 USD ($) Employee	Jun. 30, 2017 USD ($) Employee
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ (86)		$ 1,215	$ 778	$ 1,257
Business Combination, Integration Related Costs	1,375		20	1,892	213
Restructuring and Business Combination Related Expenses, Facility Reductions	0	$ 190	0	190	0
Restructuring and acquisition-related charges, net	$ 1,289		$ 1,235	$ 2,860	$ 1,470
Number of employees included in severance expense | Employee	14			14
Severance costs, employees notified in previous periods				$ 600
Restructuring and Related Cost, Number of Positions Eliminated | Employee			28		30
Other Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 1,215