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Accounts Receivable and Inventories (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounts Receivable and Inventories [Abstract] |
Schedule of accounts receivable | Accounts receivable consist of the following:
(In thousands) |  | December 31 2019 |  | December 31 2018
Trade accounts receivable |  | $ | 323,502 |  |  | $ | 251,013 |
Less: Allowance for doubtful accounts |  | (13,512 | ) |  | (4,586 | )
Trade accounts receivable, net |  | $ | 309,990 |  |  | $ | 246,427 |
Insurance claim receivable (a) |  | $ | — |  |  | $ | 30,000 |
Other receivables (b) |  | $ | 21,265 |  |  | $ | 23,770 |
(a) | Relates to the Lima Refinery litigation. See Note 11, Commitments and Contingencies, for additional information.
(b) Other receivables include employee receivables, tax claim receivables and other miscellaneous receivables not included in Trade accounts receivable, ne
Schedule of provision for doubtful accounts related to trade accounts receivable | The provision for doubtful accounts related to trade accounts receivable was as follows:
|  | Years Ended December 31
(In thousands) |  | 2019 |  | 2018 |  | 2017
Provision for doubtful accounts related to trade accounts receivable |  | $ | 7,507 |  |  | $ | 380 |  |  | $ | 5,211 |
Schedule of inventories | Inventories consist of the following:
(In thousands) |  | December 31 2019 |  | December 31 2018
Finished goods |  | $ | 14,550 |  |  | $ | 11,892 |
Work-in-process |  | 13,088 |  |  | 20,839 |
Raw materials and purchased parts |  | 104,488 |  |  | 61,547 |
Stores and supplies |  | 24,865 |  |  | 21,907 |
Total inventories |  | $ | 156,991 |  |  | $ | 116,185 |
Valued at lower of cost or market: |  |  |  |
LIFO basis |  | $ | 101,465 |  |  | $ | 66,650 |
FIFO basis |  | 7,473 |  |  | 5,719 |
Average cost basis |  | 48,053 |  |  | 43,816 |
Total inventories |  | $ | 156,991 |  |  | $ | 116,185 |
Schedule of contracts in process |

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- Definition Tabular disclosure of the expense charged against operations, the offset to which is the allowance for doubtful accounts for the purpose of reducing trade accounts receivable to an amount that approximates their net realizable value. + References No definition available. + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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