Restructuring Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	$ 5,279	$ 4,992	$ 5,765
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	449	756	2,431
Costs incurred and charged to expense	5,279	4,992	3,961
Cash payments	(4,324)	(5,299)	(5,636)
Accrued liability ending balance	1,404	449	756
Facility Relocation
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense			1,800
Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	5,279	4,992	3,961
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	449	756	731
Costs incurred and charged to expense	5,279	4,992	3,961
Cash payments	(4,324)	(5,299)	(3,936)
Accrued liability ending balance	1,404	449	756
Asset Related and Other Costs
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	0	0	1,804
Contract Assignment Costs
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	0	0	1,700
Costs incurred and charged to expense	0	0	0
Cash payments	0	0	(1,700)
Accrued liability ending balance	$ 0	$ 0	$ 0