Revenue - Sales by Major Source (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total Sales									$ 1,474,477	$ 1,577,298	$ 1,240,851
Oil & Gas Proppants
Disaggregation of Revenue [Line Items]
Total Sales									1,010,521	1,182,991
Industrial & Specialty Products
Disaggregation of Revenue [Line Items]
Total Sales									463,956	394,307
Product
Disaggregation of Revenue [Line Items]
Total Sales	$ 280,594	$ 287,977	$ 303,041	$ 296,860	$ 293,419	$ 348,635	$ 345,957	$ 294,788	1,168,472	1,282,799	1,010,394
Product | Oil & Gas Proppants
Disaggregation of Revenue [Line Items]
Total Sales									704,516	888,509
Product | Industrial & Specialty Products
Disaggregation of Revenue [Line Items]
Total Sales									463,956	394,290
Service
Disaggregation of Revenue [Line Items]
Total Sales	$ 58,465	$ 73,837	$ 91,813	$ 81,890	$ 63,961	$ 74,537	$ 81,476	$ 74,525	306,005	294,499	$ 230,457
Service | Oil & Gas Proppants
Disaggregation of Revenue [Line Items]
Total Sales									306,005	294,482
Service | Industrial & Specialty Products
Disaggregation of Revenue [Line Items]
Total Sales									$ 0	$ 17