Facilities Relocation and Other Transactions Facilities Relocation Rollforward (Details) (Facilities Relocation and Other Transition Costs [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	$ 8,880
Charges	2,170
Payments	(4,250)
Facilities Relocation, ending balance	6,800
Severance, Retention and Other Payroll Costs [Member]
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	4,121
Charges	942
Payments	(2,131)
Facilities Relocation, ending balance	2,932
Relocation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	500
Charges	817
Payments	(1,199)
Facilities Relocation, ending balance	118
Atlanta Facility Closure Costs [Member]
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	4,170
Charges	218
Payments	(638)
Facilities Relocation, ending balance	3,750
Consulting and Professional Fees [Member]
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	80
Charges	107
Payments	(187)
Facilities Relocation, ending balance	0
Other [Member]
Restructuring Cost and Reserve [Line Items]
Facilities Relocation, beginning balance	9
Charges	86
Payments	(95)
Facilities Relocation, ending balance	$ 0