Facilities Action Charges, Net Facilities Relocation Rollforward (Details) (Facilities Relocation and Other Transition Costs [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	$ 8,880
Charges	3,324
Payments	(6,563)
Facilities Relocation, ending balance	5,641
Severance, Retention and Other Payroll Costs [Member]
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	4,121
Charges	1,366
Payments	(3,293)
Facilities Relocation, ending balance	2,194
Relocation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	500
Charges	1,261
Payments	(1,761)
Facilities Relocation, ending balance	0
Atlanta Facility Closure Costs [Member]
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	4,170
Charges	395
Payments	(1,118)
Facilities Relocation, ending balance	3,447
Consulting and Professional Fees [Member]
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	80
Charges	128
Payments	(208)
Facilities Relocation, ending balance	0
Other [Member]
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	9
Charges	174
Payments	(183)
Facilities Relocation, ending balance	$ 0