Summary of Significant Accounting Policies - Accounts Receivable, net and Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bad debt expense	$ 100	$ 100
Recovery recognized related to bad debt expense previously written off			$ 1,100
Inventory, Net [Abstract]
Finished goods	9,815	17,612
Raw materials	152	243
Parts, supplies and other	32,382	30,441
Total Inventories	42,349	48,296
Inventory depreciation	$ 2,000	$ 4,500
Accounts receivable \| Customer concentration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of concentration risk	20.00%	18.00%

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Amount of increase in allowance for credit loss on accounts receivable, from recovery.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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