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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Allowances for Doubtful Accounts Table |
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
|  | (In Thousands)
At beginning of period |  | $ | 2,583 |  |  | $ | 1,286 |  |  | $ | 3,872 |
Activity in the period: |  |  |  |  |  |  |  |  |
Provision for doubtful accounts |  | 5,039 |  |  | 2,156 |  |  | 1,428 |
Account (chargeoffs) recoveries |  | (2,360 | ) |  | (859 | ) |  | (4,014 | )
At end of period |  | $ | 5,262 |  |  | $ | 2,583 |  |  | $ | 1,286 |
Inventory Disclosure | Inventories are stated at the lower of cost or net realizable value. Except for work in progress inventory, cost is determined using the weighted average method. The cost of work in progress is determined using the specific identification method. INVENTORIES Components of inventories, net of reserve, are as follows:
|  | December 31,
|  | 2019 |  | 2018
|  | (In Thousands)
Finished goods |  | $ | 70,135 |  |  | $ | 69,762 |
Raw materials |  | 4,125 |  |  | 3,503 |
Parts and supplies |  | 47,793 |  |  | 47,386 |
Work in progress |  | 14,457 |  |  | 22,920 |
Total inventories |  | $ | 136,510 |  |  | $ | 143,571 |
Finished goods inventories include newly manufactured clear brine fluids as well as used brines that are repurchased from certain customers for recycling. Work in progress inventory consists primarily of new compressor packages located at our Compression Division fabrication facility in Midland, Texas.
Property, Plant, and Equipment Table |
Buildings |  | 15 – 40 years
Machinery and equipment |  | 2 – 20 years
Automobiles and trucks |  | 3 – 4 years
Chemical plants |  | 15 – 30 years
Compressors |  | 12 – 20 years

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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