Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2009
Summary of restructuring costs associated with programs
Restructuring Charges, Total	$ 4,526
One-time Termination Benefits [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	3,374
Contract Termination [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	692
Other associated costs [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	460
November 2008 [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	976
November 2008 [Member] | One-time Termination Benefits [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	298
November 2008 [Member] | Contract Termination [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	372
November 2008 [Member] | Other associated costs [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	306
April 2009 [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	3,045
April 2009 [Member] | One-time Termination Benefits [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	2,775
April 2009 [Member] | Contract Termination [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	167
April 2009 [Member] | Other associated costs [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	103
September 2009 [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	505
September 2009 [Member] | One-time Termination Benefits [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	301
September 2009 [Member] | Contract Termination [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	153
September 2009 [Member] | Other associated costs [Member]
Summary of restructuring costs associated with programs
Restructuring Charges, Total	$ 51