Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning balance			$ 261,340	$ 261,340	$ 272,079
Impairments				0	(164,167)
Ending balance	$ 261,340			273,524	261,340
Goodwill	425,507				425,507
Impairment losses	(164,167)				(164,167)
MS Sand
Goodwill [Roll Forward]
Beginning balance	25,322				22,522
Measurement period adjustment		$ 2,800			2,800
Ending balance		$ 25,322
EPMH
Goodwill [Roll Forward]
Beginning balance			150,628	150,628
Measurement period adjustment			12,184	12,184
Acquisition					150,628
Ending balance	150,628		$ 162,812		150,628
Oil & Gas Proppants
Goodwill [Roll Forward]
Beginning balance					247,467
Impairments					(164,167)
Ending balance				86,100
Goodwill	250,267				250,267
Impairment losses	(164,167)				(164,167)
Oil & Gas Proppants | MS Sand
Goodwill [Roll Forward]
Measurement period adjustment					2,800
Oil & Gas Proppants | EPMH
Goodwill [Roll Forward]
Measurement period adjustment				0
Acquisition					0
Industrial & Specialty Products
Goodwill [Roll Forward]
Beginning balance					24,612
Impairments					0
Ending balance				187,424
Goodwill	175,240				175,240
Impairment losses	$ 0				0
Industrial & Specialty Products | MS Sand
Goodwill [Roll Forward]
Measurement period adjustment					0
Industrial & Specialty Products | EPMH
Goodwill [Roll Forward]
Measurement period adjustment				$ 12,184
Acquisition					$ 150,628