Geographic Information Reportable Segment Information (Reconciliation of Total Segment Operating Income to Consolidated Operating Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenues	$ 371,396	$ 371,396	$ 330,159	$ 255,394
Direct Costs By Segment		181,147	165,833	124,325
Operating Income (Loss)		162,162	135,950	103,923
Global Operating Costs		28,087	28,376	27,146
Business Cloud Services Segment [Member]
Segment Reporting Information [Line Items]
Revenues		361,684	330,159	255,394
Direct Costs By Segment		174,324	165,833	124,325
Operating Income (Loss)		187,360	164,326	131,069
Digital Media Segment [Member]
Segment Reporting Information [Line Items]
Revenues		9,712	0	0
Direct Costs By Segment		6,823	0	0
Operating Income (Loss)		2,889	0	0
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)		$ 190,249	$ 164,326	$ 131,069