Goodwill And Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 441,687,000		$ 441,687,000		$ 407,825,000
Amortization expense	7,500,000	3,900,000	21,600,000	11,000,000
Estimated future amortization expense in year 2013	30,000,000		30,000,000
Estimated future amortization expense in year 2014	26,200,000		26,200,000
Estimated future amortization expense in year 2015	24,000,000		24,000,000
Estimated future amortization expense in year 2016	22,100,000		22,100,000
Estimated future amortization expense in year 2017	19,700,000		19,700,000
Estimated future amortization expense thereafter	63,600,000		63,600,000
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	309,800,000		309,800,000
Digital Media Segment [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 131,900,000		$ 131,900,000