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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Activities      
Net income $ 48,098 $ 41,521 $ 34,598
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 14,384 15,204 16,255
Deferred income taxes 1,024 3,574 (12,698)
Stock-based compensation 4,861 4,807 3,811
Loss on disposal of property, plant and equipment 649 158 587
Excess tax benefits from stock compensation (3,147) (12,898) (1,466)
Other non-cash adjustments (271) (245) (337)
Changes in operating assets and liabilities:      
Accounts receivable (10,995) 867 (10,844)
Inventories 643 (1,319) (4,907)
Prepaid expenses and other assets 905 (624) (213)
Accounts payable (2,317) 5,159 3,731
Accrued expenses and other liabilities 7,554 (7,535) 15,173
Income taxes receivable/payable 1,246 9,973 1,518
Net cash provided by operating activities 62,634 58,642 45,208
Investing Activities      
Expenditures for property, plant and equipment (23,333) (12,974) (13,060)
Proceeds from sales of property, plant and equipment 35 66 176
Purchase of acquired company, net of cash acquired (31) (44)  
Notes receivable, net   79 187
Net cash used in investing activities (23,329) (12,873) (12,697)
Financing Activities      
Financing costs (3) (453) (119)
Borrowings under line of credit 225,500 143,000 74,500
Principal payments under line of credit (218,500) (143,000) (79,500)
Repurchases of common stock (53,313) (53,189) (31,277)
Proceeds from employee stock purchase and option plans 315 747 4,032
Excess tax benefits from stock compensation 3,147 12,898 1,466
Net cash used in financing activities (42,854) (39,997) (30,898)
Net (decrease) increase in cash and cash equivalents (3,549) 5,772 1,613
Cash and cash equivalents at beginning of year 9,544 3,772 2,159
Cash and cash equivalents at end of year 5,995 9,544 3,772
Supplemental disclosures of cash flow information:      
Cash paid for interest, net of capitalized interest 625 520 348
Cash paid for income taxes, net $ 26,327 $ 11,919 $ 672