Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Cash Flows from Operating Activities:
Net (Loss) Income	$ 126,291	$ 4,172	$ 121,841	$ 30,576
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation, Depletion and Amortization total	57,880	52,199	113,834	112,096
Gain on Sale of Assets			(6,546)	(10,542)
Stock-Based Compensation	1,269	1,210	5,470	2,719
Amortization of Debt Issuance Costs			3,980	4,331
Loss (Gain) on Debt Extinguishment	1,565	(106)	3,687	(789)
Unrealized Mark-to-Market Loss on Commodity Derivative Instruments	(5,571)	20,437	96,331	20,437
Deferred Income Taxes			(7,762)	(3,708)
Equity in Earnings of Affiliates			291	312
Changes in Operating Assets:
Accounts and Notes Receivable			(33,585)	45,093
Inventories			(5,567)	(3,099)
Prepaid Expenses and Other Assets			6,845	6,436
Changes in Other Assets			(10,356)	(345)
Changes in Operating Liabilities:
Accounts Payable			29,053	(6,995)
Other Operating Liabilities			31,459	2,880
Changes in Other Liabilities			(2,417)	(26,797)
Net Cash Provided by Operating Activities			346,558	172,605
Cash Flows from Investing Activities:
Capital Expenditures	(39,418)	(43,655)	(76,061)	(57,455)
Proceeds from Sales of Assets			7,418	11,918
Other Investing Activity			(1,483)	(182)
Net Cash Used in Investing Activities			(70,126)	(45,719)
Cash Flows from Financing Activities:
Payments on Finance Lease Obligations			(12,086)	(14,625)
Proceeds from Long-Term Debt			0	75,000
Shares Withheld for Taxes			(6,194)	(2,302)
Debt-Related Financing Fees			0	(2,368)
Net Cash (Used in) Provided by Financing Activities			(161,979)	22,467
Net Increase in Cash and Cash Equivalents and Restricted Cash			114,453	149,353
Cash and Cash Equivalents and Restricted Cash at Beginning of Period			198,206	50,850
Cash and Cash Equivalents and Restricted Cash at End of Period	312,659	200,203	312,659	200,203
Cash and Cash Equivalents	261,569	146,667	261,569	146,667
Restricted Cash - Current	43,025	31,669	43,025	31,669
Restricted Cash - Non-current	8,065	21,867	8,065	21,867
Cash and Cash Equivalents and Restricted Cash at End of Period	$ 312,659	$ 200,203	312,659	200,203
Non-Cash Investing and Financing Activities:
Finance Lease			4,166	8,226
Term Loan A Facility [Member]
Cash Flows from Financing Activities:
Payments on Debt			(41,250)	(12,500)
Term Loan B Facility [Member]
Cash Flows from Financing Activities:
Payments on Debt			(75,687)	(6,223)
Senior Secured Second Lien Notes due 2025 [Member]
Cash Flows from Financing Activities:
Payments on Debt			(26,387)	(14,153)
Other Asset Backed Financing [Member]
Cash Flows from Financing Activities:
Payments on Debt			$ (375)	$ (362)