Revenue - Sales by Major Source (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total Sales	$ 269,599	$ 378,750
Oil & Gas Proppants
Disaggregation of Revenue [Line Items]
Total Sales	155,715	260,477
Industrial & Specialty Products
Disaggregation of Revenue [Line Items]
Total Sales	113,884	118,273
Product
Disaggregation of Revenue [Line Items]
Total Sales	222,161	296,860
Product | Oil & Gas Proppants
Disaggregation of Revenue [Line Items]
Total Sales	108,277	178,587
Product | Industrial & Specialty Products
Disaggregation of Revenue [Line Items]
Total Sales	113,884	118,273
Service
Disaggregation of Revenue [Line Items]
Total Sales	47,438	81,890
Service | Oil & Gas Proppants
Disaggregation of Revenue [Line Items]
Total Sales	47,438	81,890
Service | Industrial & Specialty Products
Disaggregation of Revenue [Line Items]
Total Sales	$ 0	$ 0