v3.20.4

Summary of Significant Accounting Policies (Tables)

12 Months Ended

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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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

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