Intangible Assets (Schedule of Amortization and Future Amortization Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization expense on intangible assets	$ 3,609	$ 5,355	$ 7,236	$ 10,870
Estimated amortization expense, remainder of 2013	7,329		7,329
Estimated amortization expense, 2014	12,440		12,440
Estimated amortization expense, 2015	10,631		10,631
Estimated amortization expense, 2016	9,170		9,170
Estimated amortization expense, 2017	$ 8,007		$ 8,007