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Net Sales
 3 Months Ended
Mar. 31, 2021
Revenue From Contract With Customer [Abstract]  
Net Sales

9.  Net Sales

Disaggregated Net Sales

As discussed in Note 1, we primarily derive our revenues from the sales of various chemical products.  The following table presents our net sales disaggregated by our principal markets, which disaggregation is consistent with other financial information utilized or provided outside of our condensed consolidated financial statements:

 

 

 

Three Months Ended

 

 

 

March 31,

 

 

 

2021

 

 

2020

 

 

 

(In Thousands)

 

Net sales:

 

 

 

 

 

 

 

 

Agricultural products

 

$

44,913

 

 

$

41,458

 

Industrial acids and other chemical products

 

 

40,275

 

 

 

35,206

 

Mining products

 

 

12,928

 

 

 

6,747

 

Total net sales

 

$

98,116

 

 

$

83,411

 

 

Other Information

Although most of our contracts have an original expected duration of one year or less, for our contracts with a duration greater than one year at contract inception, the average remaining expected duration was approximately 18 months at March 31, 2021.

Liabilities associated with contracts with customers (contract liabilities) primarily relate to deferred revenue and customer deposits associated with cash payments received in advance from customers for volume shortfall charges and product shipments.  We had approximately $2.7 million and $2.5 million of contract liabilities as of March 31, 2021 and December 31, 2020, respectively.  For the three months ended March 31, 2021 and 2020, revenues of $1.0 million and $0.5 million, respectively, were recognized and included in the balance at the beginning of the respective period.