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Description of Business, Basis of Presentation (Narrative) (Details) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) Item	Dec. 31, 2024 USD ($) Item	Dec. 31, 2023 USD ($) Item	Dec. 31, 2025 AUD ($)	Dec. 31, 2025 USD ($)
Concentration Risk [Line Items]
Accounts receivable, net		$ 209,110			$ 250,921
Debt		412,307			686,660
Net (loss) income	$ (432,056)	(108,881)	$ 156,065
Available liquidity					172,800
Percent of contribution payable of estimated rehabilitation cost	6.50%
Agreement amendment cash balance benchmark for waiver of rebate amounts					250,000
Percent of total ERC not required due to Financial Provisioning Scheme percent	100.00%
ABL Facility [Member]
Concentration Risk [Line Items]
Maximum available credit				$ 406.6	$ 265,000
Debt term	5 years
Stated interest rate				9.00%	9.00%
Minimum [Member]
Concentration Risk [Line Items]
Customer payment due after invoicing, term	21 days
Maximum [Member]
Concentration Risk [Line Items]
Customer payment due after invoicing, term	90 days
Maximum [Member] \| ABL Facility [Member]
Concentration Risk [Line Items]
Stated interest rate				12.00%	12.00%
Five Customers [Member]
Concentration Risk [Line Items]
Revenues	$ 985,000	1,330,400	$ 1,509,100
Four Customers [Member]
Concentration Risk [Line Items]
Accounts receivable, net					$ 130,700
Three Customers [Member]
Concentration Risk [Line Items]
Accounts receivable, net		$ 119,200
Revenue [Member] \| Customer Concentration Risk [Member] \| Five Customers [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	51.10%	54.60%	53.30%
Number of customers \| Item	5	5	5
Revenue [Member] \| Customer Concentration Risk [Member] \| Customer balances individually represented 10% or more [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Four Customers [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	51.30%
Number of customers \| Item	4
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer balances individually represented 10% or more [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Three Customers [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		56.90%
Number of customers \| Item		4
Labor [Member] \| Employee Bargaining Agreements [Member] \| Coronado Group LLC [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.70%