Goodwill And Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 635,675,000	$ 457,422,000
Amortization expense	47,400,000	30,200,000	16,000,000
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets minimum useful life (years)	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets minimum useful life (years)	20 years
Business Cloud Services Segment [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	390,063,000	316,682,000	294,943,000
Digital Media Segment [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 245,612,000	$ 140,740,000	$ 112,882,000