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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 269,386 | $ 268,207
Trade accounts receivable, net of allowance for credit losses of $217 and $234 as of March 31, 2024 and December 31, 2023, respectively | 526,222 | 509,682
Inventories, net | 246,033 | 231,344
Prepaid expenses and other current assets | 34,868 | 39,064
Total current assets | 1,076,509 | 1,048,297
Property, plant, and equipment, net of accumulated depreciation and amortization of $588,735 and $558,905 as of March 31, 2024 and December 31, 2023, respectively | 607,637 | 588,992
Owned and leased mineral rights, net of accumulated depletion and amortization of $106,429 and $99,826 as of March 31, 2024 and December 31, 2023, respectively | 449,892 | 451,160
Other acquired intangibles, net of accumulated amortization of $40,218 and $38,543 as of March 31, 2024 and December 31, 2023, respectively | 44,904 | 46,579
Long-term restricted investments | 38,055 | 40,597
Long-term restricted cash | 121,927 | 115,918
Deferred income taxes | 8,284 | 8,028
Other non-current assets | 113,601 | 106,486
Total assets | 2,460,809 | 2,406,057
Current liabilities: |  |
Current portion of long-term debt | 3,392 | 3,582
Trade accounts payable | 151,453 | 128,836
Accrued expenses and other current liabilities | 186,444 | 177,512
Total current liabilities | 341,289 | 309,930
Long-term debt | 6,034 | 6,792
Workers’ compensation and black lung obligations | 186,023 | 189,226
Pension obligations | 101,800 | 101,908
Asset retirement obligations | 172,758 | 166,509
Deferred income taxes | 41,226 | 39,142
Other non-current liabilities | 20,535 | 18,622
Total liabilities | 869,665 | 832,129
Commitments and Contingencies (Note 14) |  |
Stockholders’ Equity |  |
Preferred stock - par value $0.01, 5,000,000 shares authorized, none issued | 0 | 0
Common stock - par value $0.01, 50,000,000 shares authorized, 22,371,165 issued and 13,007,215 outstanding at March 31, 2024 and 22,058,135 issued and 12,938,679 outstanding at December 31, 2023 | 224 | 221
Additional paid-in capital | 830,536 | 834,482
Accumulated other comprehensive loss | (39,837) | (40,587)
Treasury stock, at cost: 9,363,950 shares at March 31, 2024 and 9,119,456 shares at December 31, 2023 | (1,295,639) | (1,189,715)
Retained earnings | 2,095,860 | 1,969,527
Total stockholders’ equity | 1,591,144 | 1,573,928
Total liabilities and stockholders’ equity | $ 2,460,809 | $ 2,406,057

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