CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Operating Activities
Net (loss) income	$ (39,587)	$ 74,158
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	29,387	26,816
Amortization of deferred financing fees	505	446
Deferred income taxes	(21,114)	(8,471)
Stock-based compensation	5,157	7,541
Loss (gain) on sale of assets	221	(2,463)
Inventory impairment charge	7,514	0
Other contract termination settlements	0	(15,552)
Long-lived asset impairment charge	65,887	3,939
Other	968	(791)
Working capital changes:
Affiliates receivable/payable	(55)	0
Accounts receivable	2,519	(13,224)
Inventories	(12,971)	(6,834)
Other current assets	(1,849)	1,308
Accounts payable	3,148	252
Income taxes receivable/payable	14,996	(416)
Other current liabilities	(236)	1,026
Net cash provided by operating activities	54,490	67,735
Investing Activities
Expenditures for property, plant and equipment	(45,408)	(42,523)
Acquisition of mineral interests	(36,714)	(11,924)
Proceeds from the sale of assets	561	2,837
Equity method investment	(3,464)	0
Proceeds from the sale of private company equity units	3,574	18,628
Other	(146)	(170)
Net cash used for investing activities	(81,597)	(33,152)
Financing Activities
Net additions (reductions) to revolving credit agreement	10,000	(4,000)
Additions to long-term debt	5,232	3,091
Reductions to long-term debt	(4,209)	(2,919)
Cash dividends paid	(6,452)	(6,012)
Purchase of treasury shares	(3,103)	0
Net cash provided by (used for) financing activities	1,468	(9,840)
Cash and Cash Equivalents
Total (decrease) increase for the year	(25,639)	24,743
Balance at the beginning of the year	110,748	86,005
Balance at the end of the year	$ 85,109	$ 110,748