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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 $ 26,351 $ 28,181
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation 16,774 16,506
Amortization 5,775 5,356
Provision for doubtful accounts 1,321 120
Deferred income taxes (3,045) (3,100)
Asset impairments 923 0
Gain on the sale of property, plant and equipment (392) (239)
Gain on assets held for sale 0 (393)
Stock-based compensation expense 8,657 8,487
Changes in operating assets and liabilities    
Accounts receivable 6,359 (91,200)
Contract assets (2,264) (23,929)
Inventories (28,096) (146,178)
Prepaid expenses and other assets (9,404) (8,794)
Accounts payable 9,499 69,943
Advance payments from customers (12,260) 55,433
Accrued liabilities (22,324) (12,177)
Operating leases (1,004) (470)
Income taxes 2,762 8,944
Net cash used in operations (368) (93,510)
Cash flows from investing activities:    
Additions to property, plant and equipment (44,668) (23,201)
Proceeds from the sale of property, plant and equipment 635 280
Proceeds from the sale of assets held for sale 0 5,372
Additions to capitalized purchased software (2,381) (1,770)
Other (50) 5
Net cash used in investing activities (46,464) (19,314)
Cash flows from financing activities:    
Debt issuance costs (216) (555)
Proceeds from stock options exercised 68 459
Employee taxes paid for with shares withheld (5,668) (3,014)
Dividends paid (11,696) (11,628)
Borrowings under credit agreement 409,500 398,000
Principal payments on credit agreement (306,961) (263,000)
Principal payments on finance leases (86) (82)
Share repurchases 0 (9,391)
Net cash provided by financing activities 84,941 110,789
Effect of exchange rate changes (209) (5,795)
Net increase (decrease) in cash and cash equivalents and restricted cash 37,900 (7,830)
Cash and cash equivalents and restricted cash at beginning of year 207,430 271,749
Cash and cash equivalents and restricted cash at end of period $ 245,330 $ 263,919