Intangible Assets (Schedule of Amortization and Future Amortization Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization expense on intangible assets	$ 3,656	$ 4,520	$ 10,892	$ 15,390
Estimated amortization expense, remainder of 2013	3,655		3,655
Estimated amortization expense, 2014	12,500		12,500
Estimated amortization expense, 2015	10,692		10,692
Estimated amortization expense, 2016	9,230		9,230
Estimated amortization expense, 2017	$ 8,067		$ 8,067