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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Operating Activities:    
Net income (loss) $ 18,100 $ (75,000)
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 26,600 26,500
Equity compensation expense 4,300 7,900
Deferred income taxes 2,300 (3,600)
Impairment charges 200 71,800
Other non-cash charges, net (200) 400
Changes in assets and liabilities:    
Accounts receivable (20,200) (100)
Contract assets 300 200
Inventories, net (6,200) (2,800)
Other current assets (6,500) (4,600)
Accounts payable and other accrued expenses 20,600 6,200
Other, net (9,100) (1,500)
Net cash provided by operating activities 30,200 25,400
Investing Activities:    
Capital expenditures (10,800) (17,700)
Proceeds from the sale of property, plant and equipment, net 0 13,400
Proceeds from the sale of marketable equity securities 600 1,000
Purchases of short-term investments and marketable equity securities (30,100) (100)
Net cash used in investing activities (40,300) (3,400)
Financing Activities:    
Payments of finance lease obligations (900) (800)
Payments of taxes related to net share settlement of equity awards (1,300) (1,400)
Proceeds from issuance of shares to employee stock purchase plan 600 700
Share repurchases (3,000) (28,100)
Net cash used in financing activities (4,600) (29,600)
Effect of exchange rate fluctuations on cash (900) 5,000
Net decrease in cash and cash equivalents (15,600) (2,600)
Cash and cash equivalents at beginning of period 197,000 159,800
Cash and cash equivalents at end of period 181,400 157,200
Supplemental Disclosures:    
Accrued capital additions 3,100 3,900
Interest, net of amounts capitalized 800 600
Income taxes, net of refunds $ 12,400 $ 13,400