Intangible Assets (Schedule of Amortization and Future Amortization Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization expense on intangible assets	$ 5,355	$ 7,473	$ 10,870	$ 14,646
Estimated amortization expense, remainder of 2012			9,225
Estimated amortization expense, 2013			14,531
Estimated amortization expense, 2014			12,232
Estimated amortization expense, 2015			10,424
Estimated amortization expense, 2016			$ 8,962