Restructuring and Other Charges Schedule of Restructuring and Other Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Additions to restructuring cost	$ 97	$ 3,757	[1]	$ 5,946	[1]
Payments for Restructuring	(370)	(3,421)		(4,996)
Restructuring adjustment		(194)
Restructuring Reserve	1,135	1,408		1,266		$ 316
Non cash charges and adjustments, net		300		500
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Additions to restructuring cost	0	3,128	[1]	4,689	[1]
Payments for Restructuring	0	(2,941)		(4,992)
Restructuring adjustment		(194)
Restructuring Reserve	6	6		13		316
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Additions to restructuring cost	97	629	[1]	1,257	[1]
Payments for Restructuring	(370)	(480)		(4)
Restructuring adjustment		0
Restructuring Reserve	$ 1,129	$ 1,402		$ 1,253		$ 0

[1] Total restructuring and other charges recognized in the Company's consolidated statements of operations for the years ended December 31, 2016 and 2015 included non-cash charges and adjustments, net of $0.3 million and $0.5 million, respectively. These amounts have been excluded from the table above.