Goodwill and Intangible Assets (Amortization Expense) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Aggregate amortization expense	$ 3,500,000	$ 1,900,000
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Remaining 2013	10,428,000
2014	13,267,000
2015	12,722,000
2016	12,101,000
2017	$ 11,738,000