Intangible Assets (Schedule of Amortization and Future Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization expense on intangible assets	$ 5,872	$ 6,040	$ 11,744	$ 12,032
Estimated amortization expense, remainder of 2017	11,842		11,842
Estimated amortization expense, 2018	21,513		21,513
Estimated amortization expense, 2019	17,178		17,178
Estimated amortization expense, 2020	16,241		16,241
Estimated amortization expense, 2021	$ 10,634		$ 10,634