Goodwill and Intangible Assets - Carrying Amount of Goodwill by Business Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Goodwill [Roll Forward]
Balance at December, 2019	$ 273,524
Impairment loss	(86,100)
Balance at March 31, 2020	185,649
EPM
Goodwill [Roll Forward]
Impairment loss	(86,100)
EPM acquisition adjustment	(1,775)
Oil & Gas Proppants
Goodwill [Roll Forward]
Balance at December, 2019	86,100
Balance at March 31, 2020	0
Oil & Gas Proppants | EPM
Goodwill [Roll Forward]
Impairment loss	(86,100)
EPM acquisition adjustment	0
Industrial & Specialty Products
Goodwill [Roll Forward]
Balance at December, 2019	187,424
Balance at March 31, 2020	185,649
Industrial & Specialty Products | EPM
Goodwill [Roll Forward]
Impairment loss	0
EPM acquisition adjustment	$ (1,775)