Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net Income (Loss)	$ 34,110	$ (13,214)	$ 93,558
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities:
Depreciation, Depletion and Amortization total	224,583	210,760	207,097
Stock/Unit-Based Compensation	6,632	11,579	12,760
Gain on Sale of Assets	(11,723)	(15,295)	(1,995)
Amortization of Debt Issuance Costs	8,552	7,447	6,416
(Gain) Loss on Debt Extinguishment	(657)	(21,352)	24,455
Loss on Commodity Derivative Instruments	52,204	0	0
Deferred Income Taxes	(14,760)	11,685	(17,419)
Equity in Earnings of Affiliates	644	1,251	0
Changes in Operating Assets:
Trade and Other Receivables	44,707	11,130	(38,960)
Inventories	(6,676)	(2,069)	(5,485)
Prepaid Expenses and Other Assets	229	7,574	497
Changes in Other Assets	(13,797)	(21,058)	17,302
Changes in Operating Liabilities:
Accounts Payable	11,473	(30,759)	(21,714)
Other Operating Liabilities	27,461	(2,915)	(7,884)
Changes in Other Liabilities	(57,413)	(25,433)	(24,062)
Net Cash Provided by Operating Activities	305,569	129,331	244,566
Cash Flows from Investing Activities:
Capital Expenditures	(132,752)	(86,004)	(169,739)
Proceeds from Sales of Assets	13,572	9,899	2,201
Other Investing Activity	(8,181)	(229)	(5,003)
Net Cash Used in Investing Activities	(127,361)	(76,334)	(172,541)
Cash Flows from Financing Activities:
Proceeds from Finance Lease Obligations	0	19,314	0
Payments on Finance Lease Obligations	(27,447)	(28,295)	(18,549)
Proceeds from Long-Term Debt	75,000	0	0
Distributions to Noncontrolling Interest	0	(5,575)	(22,220)
Shares/Units Withheld for Taxes	(2,303)	(863)	(4,963)
Repurchases of Common Stock	0	0	(32,733)
Purchases of CCR Units	0	0	(369)
Debt Issuance and Financing Fees	(2,368)	(9,002)	(12,492)
Net Cash Used in Financing Activities	(30,852)	(82,440)	(256,667)
Net Increase (Decrease) in Cash and Cash Equivalents and Restricted Cash	147,356	(29,443)	(184,642)
Cash and Cash Equivalents and Restricted Cash at Beginning of Period	50,850	80,293	264,935
Cash and Cash Equivalents and Restricted Cash at End of Period	198,206	50,850	80,293
Term Loan A Facility [Member]
Cash Flows from Financing Activities:
Proceeds from Debt	0	0	26,250
Payments on Debt	(25,000)	(22,500)	(11,250)
Term Loan B Facility [Member]
Cash Flows from Financing Activities:
Payments on Debt	(30,911)	(2,750)	(124,437)
Senior Secured Second Lien Notes due 2025 [Member]
Cash Flows from Financing Activities:
Payments on Debt	(17,092)	(32,064)	(59,421)
Other Asset Backed Financing [Member]
Cash Flows from Financing Activities:
Proceeds from Debt	0	0	3,757
Payments on Debt	$ (731)	$ (705)	$ (240)