Restructuring (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of operating segments | segment	2
Severance costs		$ 2,900	$ 3,300
Restructuring reserve	$ 2,840	1,857	2,840
Restructuring charges		2,930	3,317	$ 0
Payments for Restructuring		(3,913)
Accounts Payable and Accrued Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	2,200	1,500	2,200
Other Noncurrent Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	600	400	600
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0	591	0
Restructuring charges		1,252
Payments for Restructuring		(661)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 2,840	1,266	$ 2,840
Restructuring charges		1,678
Payments for Restructuring		$ (3,252)