Restructuring and Other Related Costs Amount of restructuring and other related costs recognized during the year (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	$ 8,100	$ 0	$ 0	$ 0	$ 0	$ 8,100	$ 0
Employee Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	5,700
Real Estate Exit and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	800
Asset Write-offs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other related costs	$ 1,500