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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities    
Net income $ 40,996 $ 162,165
Adjustments to reconcile net income to net cash provided by operating activities:    
Deferred income taxes 7,736 30,600
Loss (gain) on extinguishment of debt (8,644) 113
Depreciation and amortization of property, plant and equipment 34,416 33,883
Amortization of intangible and other assets 291 621
Stock-based compensation 2,646 2,168
Other 2,832 (850)
Cash provided (used) by changes in assets and liabilities:    
Accounts receivable 24,937 (8,631)
Inventories 8,171 (19,392)
Prepaid insurance 10,346 8,070
Supplies, prepaid items and other 2,192 (4,749)
Accounts payable (14,789) 20,974
Accrued interest (4,054) (1,008)
Other assets and other liabilities (4,127) (3,151)
Net cash provided by operating activities 102,949 220,813
Cash flows from investing activities    
Expenditures for property, plant and equipment (32,263) (16,431)
Proceeds from short-term investments 264,212  
Purchases of short-term investments (201,751) (325,566)
Other investing activities 10 63
Net cash provided (used) by investing activities 30,208 (341,934)
Cash flows from financing activities    
Net proceeds from 6.25% senior secured notes   200,000
Repurchases of 6.25% senior secured notes (114,320)  
Payments on other long-term debt (6,800) (8,907)
Payments on short-term financing (11,016) (7,034)
Acquisition of treasury stock, net (19,718) (15,264)
Payments of debt-related costs, including extinguishment costs   (4,454)
Other financing activities   (133)
Net cash provided (used) by financing activities (151,854) 164,208
Net increase (decrease) in cash and cash equivalents (18,697) 43,087
Cash and cash equivalents at beginning of period 63,769 82,144
Cash and cash equivalents at end of period $ 45,072 $ 125,231