Restructuring and Other Charges - Restructuring Reserve Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 1,061		$ 2,318	$ 1,456
Business Combination, Integration Related Costs	226	$ 0	439	$ 146
Restructuring and Business Combination Related Expenses, Facility Reductions	57	$ 0	57
Balance accrued as of December 31, 2013			1,437
Restructuring Charges			2,541
Restructuring Reserve, Accrual Adjustment			(166)
Expenditures			(2,904)
Balance accrued as of September 30, 2014	908		908
Severance, Payroll Taxes and Other Employee Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Balance accrued as of December 31, 2013			1,347
Restructuring Charges			2,484
Restructuring Reserve, Accrual Adjustment			(166)
Expenditures			(2,757)
Balance accrued as of September 30, 2014	908		908
Lease Abandonment Charges [Member]
Restructuring Cost and Reserve [Line Items]
Balance accrued as of December 31, 2013			90
Restructuring Charges			57
Restructuring Reserve, Accrual Adjustment			0
Expenditures			(147)
Balance accrued as of September 30, 2014	$ 0		$ 0