Restructuring Charges Restructuring Liability Rollforward (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 1,142	$ 159
Restructuring and Related Cost, Incurred Cost	1,599
Payments for Restructuring	(606)
Restructuring Reserve, Accrual Adjustment	(10)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	7	68
Restructuring and Related Cost, Incurred Cost	411
Payments for Restructuring	(474)
Restructuring Reserve, Accrual Adjustment	2
Office Space Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	79	91
Restructuring and Related Cost, Incurred Cost	0
Payments for Restructuring	0
Restructuring Reserve, Accrual Adjustment	(12)
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	1,056	$ 0
Restructuring and Related Cost, Incurred Cost	1,188
Payments for Restructuring	(132)
Restructuring Reserve, Accrual Adjustment	$ 0