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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 $ 175,631 $ 144,738 $ 134,572
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 17,939 14,031 16,597
Deferred income taxes 13,125 7,706 1,037
Stock-based compensation 7,131 6,930 6,344
(Gain) loss on disposal of property, plant and equipment (56) 285 47
Other non-cash adjustments 51 (218) (406)
Changes in operating assets and liabilities:      
Accounts receivable (28,286) 12,701 (24,281)
Inventories (12,132) 1,695 (23,276)
Prepaid expenses and other assets (358) (1,652) (613)
Accounts payable 11,353 (16,666) 21,131
Accrued expenses and other liabilities 7,655 (10,823) 5,040
Income taxes receivable/payable (4,759) (2,375) 1,929
Net cash provided by operating activities 187,294 156,352 138,121
Investing Activities      
Expenditures for property, plant and equipment and intangibles (172,823) (67,265) (33,816)
Proceeds from sales of property, plant and equipment 2,165 21 83
Net cash used in investing activities (170,658) (67,244) (33,733)
Financing Activities      
Borrowings under line of credit 276,000 89,500 172,250
Principal payments under line of credit (276,000) (89,500) (172,250)
Repurchases of common stock (44,854) (46,545) (30,085)
Proceeds from employee stock purchase and option plans 1,446 1,089 882
Financing costs (360) (518)  
Net cash used in financing activities (43,768) (45,974) (29,203)
Net (decrease) increase in cash and cash equivalents (27,132) 43,134 75,185
Cash and cash equivalents, beginning of period 148,833 105,699 30,514
Cash and cash equivalents, end of period 121,701 148,833 105,699
Supplemental Disclosure:      
Cash paid for interest 187 321 662
Cash paid for income taxes, net $ 50,744 $ 39,612 $ 48,238