Fair Value Measurement of Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Impairment of trademark	$ 161,224
Derivative, maturing in 2021	150,000
Derivative, maturing in 2022	$ 150,000
Gross licensing revenue payable, percentage	3.50%
Licensing revenue payment period	5 years
Accretion expense	$ 100
Amortization expense	500	$ 200
Trademarks [Member]
Impairment of trademark	161,224
Maximum [Member]
Accretion expense		$ 100
Interest Rate Cap [Member]
Derivative, notional amount	$ 300,000