v3.20.4

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Schedule of inventories | Inventories consisted of the following:
| December 31,
(in thousands) | 2020 |  | 2019
Finished goods | $ | 9,815 |  |  | $ | 17,612 |
Raw materials | 152 |  |  | 243 |
Parts, supplies and other | 32,382 |  |  | 30,441 |
Total Inventories | $ | 42,349 |  |  | $ | 48,296 |
Schedule of lives used in computing depreciation for depreciable assets and components of property, plant and equipment, net | The lives used in computing depreciation for significant asset classes are as follows:
Asset |  | Range of Useful Lives, in Years
Land and improvements |  | 10 to 30
Buildings and improvements |  | 3 to 30
Automotive equipment |  | 5 to 30
Machinery and equipment |  | 2 to 30
Other |  | 3 to 10
Property, plant and equipment, net consisted of the following:
| December 31,
(in thousands) | 2020 |  | 2019
Machinery and equipment | $ | 1,388,735 |  |  | $ | 1,378,651 |
Buildings and improvements | 17,598 |  |  | 17,221 |
Automotive equipment | 16,608 |  |  | 16,691 |
Land and improvements | 14,132 |  |  | 14,075 |
Construction in progress | 12,098 |  |  | 5,198 |
Other | 1,721 |  |  | 1,752 |
| 1,450,892 |  |  | 1,433,588 |
Less: Accumulated depreciation | 553,045 |  |  | 481,629 |
Total Property, plant and equipment, net | $ | 897,847 |  |  | $ | 951,959 |

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