Restructuring (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended						36 Months Ended
	Mar. 31, 2009	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009		Dec. 31, 2011
Reduction in headcount, number of full-time positions	450
Restructuring charges		$ 24	[1]	$ 971	[1]	$ 26,473	[1]	$ 27,500
Restructuring accruals		32		1,275				32
Enterprise Division [Member]
Restructuring charges		24		796		25,460		26,300
Online Services Division [Member]
Restructuring charges		$ 0		$ 175		$ 1,013		$ 1,200

[1] Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.