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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Activities      
Net income $ 90,398 $ 32,291 $ 50,933
Adjustments to reconcile net income to cash provided by operating activities, net of effects of acquisition:      
Depreciation and amortization 27,576 29,331 31,972
Stock-based compensation 6,128 6,330 5,809
Excess and obsolescence inventory reserve 1,046 (185)
(Gain) loss on sale of assets (52) 54 (10)
Deferred income taxes 3,863 (2,424) (4,371)
Changes in operating assets and liabilities:      
Trade receivables (5,236) (7,609) 15,051
Inventories 10,624 2,073 8,479
Trade accounts payable and accrued expenses 7,954 (3,646) 939
Contract liability to customers (9,539) 2,146 5,250
Employee compensation and benefits 20,910 (6,646) 6,009
Product liability 308 (354) 353
Prepaid expenses, other assets and other liabilities (7,905) (888) (3,757)
Income taxes payable (1,223) (2,117) 3,340
Cash provided by operating activities 143,806 49,587 119,812
Investing Activities      
Property, plant, and equipment additions (24,229) (20,296) (10,541)
Purchase of Marlin assets (28,316)
Purchases of short-term investments (369,439) (282,738) (114,259)
Proceeds from maturity of short-term investments 377,920 267,576
Net proceeds from sale of assets 178 14 10
Cash used for investing activities (43,886) (35,444) (124,790)
Financing Activities      
Dividends paid (113,896) (14,319) (19,201)
Repurchase of common stock (1,995)
Payment of employee withholding tax related to share-based compensation (1,297) (901) (816)
Cash used for financing activities (115,193) (17,215) (20,017)
Decrease in cash and cash equivalents (15,273) (3,072) (24,995)
Cash and cash equivalents at beginning of year 35,420 38,492 63,487
Cash and cash equivalents at end of year $ 20,147 $ 35,420 $ 38,492