Restructuring Charges (Accrued Restructuring Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Accrued Restructuring Costs at December 31, 2010	$ 18,221
Costs Incurred	15,512
Costs Paid or Settled	(19,347)
Stock-based Compensation	(5,701)
Accrued Restructuring Costs at December 31, 2011	8,685
Workforce Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Accrued Restructuring Costs at December 31, 2010	15,120
Costs Incurred	7,824
Costs Paid or Settled	(16,661)
Stock-based Compensation	(5,701)
Accrued Restructuring Costs at December 31, 2011	582
Excess Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Accrued Restructuring Costs at December 31, 2010	3,101
Costs Incurred	7,688
Costs Paid or Settled	(2,686)
Stock-based Compensation
Accrued Restructuring Costs at December 31, 2011	$ 8,103