Intangible Assets (Schedule of Amortization and Future Amortization Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization expense on intangible assets	$ 3,145	$ 3,627
Estimated amortization expense, remainder of 2013	9,459
Estimated amortization expense, 2014	10,791
Estimated amortization expense, 2015	9,330
Estimated amortization expense, 2016	8,166
Estimated amortization expense, 2017	$ 7,245