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Accounts Receivable and Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] |  |  |  |
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 | 0 | 30,000 |  |
Other receivables | 21,265 | 23,770 |  |
Provision for doubtful accounts related to trade accounts receivable | 7,507 | 380 | $ 5,211 |
Inventories |  |  |  |
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 |  |
Excess of inventories valued at current costs over LIFO | 0 | 23,000 |  |
Change in income as a result of LIFO basis inventory valuation over FIFO basis valuation | 0 | 600 | 400 |
Provision for Loss on Contracts | 6,400 |  |  |
Contract estimated forward loss provision for Harsco Rail Segment |  | 1,800 |  | $ 45,100
Revenues | 1,503,742 | 1,347,672 | 1,307,470 |
SBB [Member] |  |  |  |
Valued at lower of cost or market: |  |  |  |
Revenues | $ 23,400 | $ 24,200 | $ 42,500 |
Contract 2 | SBB [Member] |  |  |  |
Valued at lower of cost or market: |  |  |  |
Percentage Complete | 42.00% |  |  |

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