Restructuring and Other Related Costs Amount of restructuring and other related costs recognized during the year (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2015	Sep. 30, 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	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	$ 3,604		$ 3,573	$ 566	$ 0	$ 47	$ 0	$ (298)	$ 370	$ 4,217	$ 3,645	$ 5,716
Employee Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	2,500		1,800							2,484	900	4,568
Restructuring reserve accrual adjustment											(900)
Restructuring Reserve	2,202		2,031							2,202	2,031	4,568	$ 427
Real Estate Exit and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	1,100		1,600							1,719	2,513	615
Restructuring reserve accrual adjustment		$ 600									900
Restructuring Reserve	2,935		2,600							2,935	2,600	769	507
Asset Write-offs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs			200							14	232	533
Restructuring Reserve	0		0							0	0	0	0
Accrued Restructuring Liability [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	5,137		4,631							5,137	4,631	$ 5,337	$ 934
Minimum [Member] | Real Estate Exit and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	500									500
Maximum [Member] | Real Estate Exit and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	700									700
Other Current Liabilities [Member] | Accrued Restructuring Liability [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	4,100		3,400							4,100	3,400
Other Noncurrent Liabilities [Member] | Accrued Restructuring Liability [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 1,000		$ 1,200							$ 1,000	$ 1,200