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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Cash flows from operating activities          
Net income     $ 162,165 $ 10,391  
Adjustments to reconcile net income to net cash provided by operating activities:          
Deferred income taxes $ 19,777 $ (73) 30,600 256  
Loss (gain) on extinguishment of debt   (10,000) 113 (10,000)  
Depreciation and amortization of property, plant and equipment     33,883 33,725  
Amortization of intangible and other assets     621 629  
Other     1,318 1,749  
Cash provided (used) by changes in assets and liabilities:          
Accounts receivable     (8,631) (23,369)  
Inventories     (19,392) 5,535  
Prepaid insurance     8,070 6,633  
Accounts payable     20,974 3,627  
Accrued interest     (1,008) (20)  
Other assets and other liabilities     (7,900) 1,425  
Net cash provided by operating activities     220,813 30,581  
Cash flows from investing activities          
Expenditures for property, plant and equipment     (16,431) (14,849)  
Purchases of short-term investments     (325,566)    
Other investing activities     63 300  
Net cash used by investing activities     (341,934) (14,549)  
Cash flows from financing activities          
Proceeds from revolving debt facility       12,000  
Payments on revolving debt facility       (12,000)  
Net proceeds from 6.25% senior secured notes     200,000    
Payments on other long-term debt     (8,907) (5,520)  
Payments on short-term financing     (7,034) (9,060)  
Payments of debt-related costs, including extinguishment costs     (4,454)    
Acquisition of treasury stock     (15,264) (46)  
Other financing activities     (133) (45)  
Net cash provided (used) by financing activities     164,208 (14,671)  
Net increase in cash and cash equivalents     43,087 1,361  
Cash and cash equivalents at beginning of period     82,144 16,264 $ 16,264
Cash and cash equivalents at end of period $ 125,231 $ 17,625 $ 125,231 $ 17,625 $ 82,144