Restructuring and Other Related Costs Amount of restructuring and other related costs recognized during the year (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	$ 3,573,000	$ 0	$ (298,000)	$ 370,000	$ 5,716,000	$ 0	$ 0	$ 0	$ 3,645,000	$ 5,716,000	$ 0
Employee Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	1,800,000				4,568,000				900,000
Restructuring Reserve	2,031,000				4,568,000				2,031,000	4,568,000	427,000	5,372,000
Restructuring Reserve, Accrual Adjustment									(900,000)
Real Estate Exit and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	1,600,000				615,000				2,513,000
Restructuring Reserve	2,600,000				769,000				2,600,000	769,000	507,000	831,000
Restructuring Reserve, Accrual Adjustment									900,000
Asset Write-offs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	200,000				533,000				232,000
Restructuring Reserve	0				0				0	0	0	0
Accrued Restructuring Liability [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	4,631,000				5,337,000				4,631,000	5,337,000	934,000	6,203,000
Minimum [Member] | Real Estate Exit and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs					500,000
Maximum [Member] | Real Estate Exit and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	2,200,000
Other Current Liabilities [Member] | Accrued Restructuring Liability [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	3,400,000				4,700,000				3,400,000	4,700,000
Other Noncurrent Liabilities [Member] | Accrued Restructuring Liability [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 1,200,000				$ 600,000				$ 1,200,000	$ 600,000