Segment Information Reportable Segment Information (Reconciliation of Total Segment Operating Income to Consolidated Operating Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 161,253	$ 134,124
Income from operations	40,530	41,585
Global Operating Costs	10,656	8,285
Business Cloud Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	118,061	100,830
Direct Costs By Segment	71,043	55,612
Income from operations	47,018	45,218
Digital Media Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	43,257	33,368
Direct Costs By Segment	39,089	28,716
Income from operations	4,168	4,652
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Total revenues	(65)	(74)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations	$ 51,186	$ 49,870