Intangible Assets (Schedule of Amortization and Future Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization expense on intangible assets	$ 5,879	$ 6,122	$ 17,623	$ 18,154
Estimated amortization expense, remainder of 2017	5,919		5,919
Estimated amortization expense, 2018	21,506		21,506
Estimated amortization expense, 2019	17,171		17,171
Estimated amortization expense, 2020	16,237		16,237
Estimated amortization expense, 2021	$ 10,627		$ 10,627