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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities    
Net income (loss) $ 58,766 $ (13,279)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Deferred income taxes 10,823 327
Depreciation and amortization of property, plant and equipment 17,197 16,762
Amortization of intangible and other assets 311 315
Other 1,438 (1,058)
Cash provided (used) by changes in assets and liabilities:    
Accounts receivable (11,707) (17,321)
Inventories (10,817) 625
Prepaid insurance 3,687 2,265
Accounts payable 10,003 8,598
Accrued interest 13,618 10,412
Other assets and other liabilities (7,827) 5,065
Net cash provided by operating activities 85,492 12,711
Cash flows from investing activities    
Expenditures for property, plant and equipment (8,254) (6,133)
Purchases of short-term investments (89,311)  
Other investing activities 51 198
Net cash used by investing activities (97,514) (5,935)
Cash flows from financing activities    
Net proceeds from 6.25% senior secured notes 200,000  
Payments on other long-term debt (6,912) (3,353)
Payments on short-term financing (2,805) (5,419)
Payments of debt-related costs, including extinguishment costs (4,102)  
Other financing activities (2,004) (36)
Net cash provided (used) by financing activities 184,177 (8,808)
Net increase (decrease) in cash and cash equivalents 172,155 (2,032)
Cash and cash equivalents at beginning of period 82,144 16,264
Cash and cash equivalents at end of period $ 254,299 $ 14,232