Annual report pursuant to Section 13 and 15(d)

Revenue From Contracts With Customers (Details)

v3.20.4
Revenue From Contracts With Customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Performance obligation description However, settlement statements for certain sales may be received for 30 to 90 days after the date production is delivered, and as a result, the Company is required to estimate the amount of production that was delivered to the purchaser and the price that will be received for the sale of the product.  
Receivables from customers $ 119,879 $ 121,210
Maximum    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Performance obligation description 30 days