Intangible Assets and Goodwill - Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Intangible Assets and Goodwill
Goodwill at the beginning of the period	$ 90,976
Goodwill Impairment	(90,976)
Amount of carrying amount in excess of fair value amount	$ 91,000