Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-Lived License Agreements	$ 96,229				$ 88,106				$ 86,762	$ 96,229	$ 88,106	$ 86,762
Assets, Fair Value Disclosure, Nonrecurring									13,282			13,282
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 0	$ 0	$ 0	$ 0	874	$ 0	$ 0	$ 0	1,936	$ 0	874	1,936
Other Intangible Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-Lived License Agreements					13,282				$ 15,218		13,282	$ 15,218
Assets, Fair Value Disclosure, Nonrecurring					$ 12,408						12,408
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)											$ 874