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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:          
Net income $ 316,622 $ 385,005 $ 1,710,895 $ 3,041,174 $ 663,254
Adjustments to reconcile net income to net cash provided by operating activities:          
Depreciation and amortization 198,729 173,983 770,573 656,787 503,539
Lower of cost or market inventory valuation adjustment (219,370) 47,597 270,419 52,412 (310,123)
Earnings of equity method investments, inclusive of distributions (3,821) (1,799) 8,093 19,769 0
Early extinguishment loss on debt     0 (604) 0
Gain on sale of assets (782) (414) (6,879) (2,118) (89,765)
Deferred income taxes 14,769 15,305 192,550 53,168 128,570
Equity-based compensation expense 5,380 3,325 41,135 30,318 39,273
Change in fair value – derivative instruments (7,764) 15,402 16,555 9,989 (34,096)
(Increase) decrease in current assets:          
Accounts receivable (92,036) 86,369 (17,131) (4,282) (614,407)
Inventories 1,120 (280,263) 30,246 (224,421) (344,559)
Income taxes receivable 13,462 10,494 (2,691) 42,641 (6,415)
Prepayments and other 1,263 28,007 8,062 (40,810) (18,672)
Increase (decrease) in current liabilities:          
Accounts payable 64,664 (220,018) (108,859) 194,424 612,410
Income taxes payable 48,689 51,697 925 (17,169) 23,158
Accrued liabilities 30,655 32,424 (29,619) 78,349 83,602
Turnaround expenditures (70,379) (163,734) (555,697) (144,759) (214,431)
Other, net 15,694 (5,675) (31,342) 32,291 (14,656)
Net cash provided by operating activities 316,895 177,705 2,297,235 3,777,159 406,682 Close
Cash flows from investing activities:          
Additions to properties, plants and equipment (89,108) (100,069) (353,451) (485,043) (725,073)
Acquisitions, net of cash acquired     0 (251,448) (624,332)
Proceeds from sale of assets 811 1,572 17,361 3,344 106,357
Investment in Osage Pipe Line Company LLC (5,000) (2,500)      
Distributions from equity method investments in excess of equity earnings 1,925 760 4,211 10,623 4,165
Net cash used for investing activities (91,372) (100,237) (371,323) (774,488) (1,327,219) Close
Cash flows from financing activities:          
Borrowings under credit agreements 0 42,000 60,000 510,000 555,500
Repayments under credit agreements (61,500) (58,500) (272,500) (682,000) (629,000)
Redemption of senior notes - HEP     (307,827) (41,420) 0
Purchase of treasury stock (169,612) (245,566) (999,282) (1,371,700) (7,058)
Dividends (99,353) (87,987) (340,736) (255,928) (57,663)
Distributions to noncontrolling interests (2,395) (25,986) (102,523) (96,192) (75,395)
Contributions from noncontrolling interests     0 0 23,194
Payments on finance leases (2,600) (3,071) (11,923) (11,713) (3,990)
HEP Merger Transaction consideration     (267,592) 0 0
Deferred financing costs     (899) (9,273) (14,500)
Other, net     (600) (2,533) (2,891)
Net cash used for financing activities (335,460) (379,110) (2,243,882) (1,560,759) (211,803) Close
Effect of exchange rate on cash flow (2,950) 1,506 6,651 (11,290) (1,534) Close
Cash and cash equivalents:          
Decrease for the period (112,887) (300,136) (311,319) 1,430,622 (1,133,874) Close
Beginning of period 1,353,747 1,665,066 1,665,066 234,444 1,368,318
End of period 1,240,860 1,364,930 1,353,747 1,665,066 234,444
Cash paid during the period for:          
Interest (23,600) (25,934) (203,063) (160,409) (136,429)
Income taxes, net (7,644) (22,010) (250,815) (816,379) 19,760
Decrease in accrued and unpaid capital expenditures $ (5,678) $ (17,819) (5,924) (31,714) (15,319)
HEP          
Cash flows from investing activities:          
Additions to properties, plants and equipment     (31,962) (38,964) (88,336)
Investment in Osage Pipe Line Company LLC     (7,482) (13,000) 0
Cash flows from financing activities:          
Proceeds from issuance of senior notes - HEP     $ 0 $ 400,000 $ 0