The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets and Goodwill - Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Intangible assets
Amortization of Acquired Intangible Assets	$ 0	$ 0		$ 0	$ 224
Indefinite-lived intangible assets	$ 48,700	$ 48,700		$ 48,700	48,700
Non-cash impairment charge, indefinite-lived					$ 18,677
License Rights
Intangible assets
Non-cash impairment charge, finite lived			$ 18,700