Intangible Assets (Schedule of Amortization and Future Amortization Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization expense on intangible assets	$ 4,520	$ 7,721	$ 15,390	$ 22,367
Estimated amortization expense, remainder of 2012			4,520
Estimated amortization expense, 2013			14,597
Estimated amortization expense, 2014			12,297
Estimated amortization expense, 2015			10,489
Estimated amortization expense, 2016			$ 9,028