Segment Information Reportable Segment Information (Reconciliation of Total Segment Operating Income to Consolidated Operating Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 176,038	$ 144,744	$ 337,291	$ 278,868
Direct Costs By Segment	113,844	92,873	223,976	177,201
Income from operations	50,066	44,838	90,596	86,422
Global Operating Costs	12,185	7,085	22,841	15,371
Business Cloud Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	125,188	106,523	243,249	207,353
Direct Costs By Segment	72,858	60,156	143,901	115,768
Income from operations	52,330	46,367	99,348	91,585
Digital Media Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	50,907	38,274	94,164	71,642
Direct Costs By Segment	40,986	32,717	80,075	61,433
Income from operations	9,921	5,556	14,089	10,208
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Total revenues	(57)	(53)	(122)	(127)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations	$ 62,251	$ 51,923	$ 113,437	$ 101,793