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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities    
Net income $ 33,270 $ 164,477
Adjustments to reconcile net income to net cash provided by operating activities:    
Deferred income taxes 2,883 31,210
(Gain) loss on extinguishment of debt (8,644) 113
Depreciation and amortization of property, plant and equipment 49,852 50,013
Amortization of intangible and other assets 403 889
Stock-based compensation 3,964 3,089
Other 1,654 (2,484)
Cash provided (used) by changes in assets and liabilities:    
Accounts receivable 28,365 (22,105)
Inventories 6,727 (13,147)
Prepaid insurance 15,566 12,486
Supplies, prepaid items and other 1,761 (3,455)
Accounts payable (12,672) 32,004
Accrued interest 2,237 10,010
Accrued payroll and benefits (5,489) (2,298)
Other assets and other liabilities 645 (1,620)
Net cash provided by operating activities 120,522 259,182
Cash flows from investing activities    
Expenditures for property, plant and equipment (41,123) (32,531)
Proceeds from short-term investments 293,347 59,728
Purchases of short-term investments (230,690) (423,091)
Other investing activities (28) 2,946
Net cash provided (used) by investing activities 21,506 (392,948)
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 (8,155) (10,950)
Payments on short-term financing (16,134) (11,291)
Acquisition of treasury stock, net (20,364) (101,912)
Payments of debt-related costs, including extinguishment costs   (4,455)
Other financing activities   (135)
Net cash (used) provided by financing activities (158,973) 71,257
Net (decrease) increase in cash and cash equivalents (16,945) (62,509)
Cash and cash equivalents at beginning of period 63,769 82,144
Cash and cash equivalents at end of period $ 46,824 $ 19,635