Intangible Assets - Finite Lived (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Indefinite-lived intangible asset impairment	$ 0	$ 38,000
Indefinite Lived Intangible Assets Excluding Goodwill	205,100		$ 205,100
Houghton Combination [Member]
Finite Lived Intangible Assets [Line Items]
Indefinite Lived Intangible Assets Excluding Goodwill	$ 204,000		$ 204,000