Goodwill and Other Intangible Assets Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquired intangible assets	$ 4,859,000	$ 5,381,000	$ 16,653,000	$ 15,611,000
Future amortization expense to be recognized in remainder of current year	4,900,000		4,900,000
Future amortization expense 2014	20,600,000		20,600,000
Future amortization expense 2015	18,800,000		18,800,000
Future amortization expense 2016	14,000,000		14,000,000
Future amortization expense 2017	$ 9,500,000		$ 9,500,000