Intangible Assets and Goodwill (Details 1) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2011
Summary of roll forward of the changes in goodwill
Goodwill, beginning of period		$ 1,146,314,000	$ 1,146,300,000
Goodwill acquired during the period		51,600,000	0
Other Goodwill Adjustments	6,800,000	6,800,000	0
Goodwill, end of period	$ 1,204,740,000	$ 1,204,740,000	$ 1,146,314,000