Restructuring and Other Related Costs Restructuring plan provision summary (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Restructuring Charges	$ 3,604	$ 3,573	$ 566	$ 0	$ 47	$ 0	$ (298)	$ 370	$ 4,217	$ 3,645	$ 5,716
Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning					4,568			427	2,031	4,568	427
Cash Payments									(2,160)	(3,437)	(427)
Restructuring Charges	2,500	1,800							2,484	900	4,568
Non-cash payments									(153)	0	0
Restructuring Reserve, Ending	2,202	2,031							2,202	2,031	4,568
Real Estate Exit and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning					769			507	2,600	769	507
Cash Payments									(1,384)	(682)	(353)
Restructuring Charges	1,100	1,600							1,719	2,513	615
Non-cash payments									0	0	0
Restructuring Reserve, Ending	2,935	2,600							2,935	2,600	769
Asset Write-offs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning					0			0	0	0	0
Cash Payments									0	0	0
Restructuring Charges		200							14	232	533
Non-cash payments									(14)	(232)	(533)
Restructuring Reserve, Ending	0	0							0	0	0
Accrued Restructuring Liability [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning					$ 5,337			$ 934	4,631	5,337	934
Restructuring Reserve, Ending	$ 5,137	$ 4,631							$ 5,137	$ 4,631	$ 5,337