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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 35,415 $ 41,275
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 21,778 19,841
Amortization 2,702 2,358
Deferred income taxes 5,000 6,674
Gain on the sale of property, plant and equipment (15) (69)
Asset impairments 84 610
Thailand flood insurance recovery 0 (550)
Stock-based compensation expense 4,020 3,680
Excess tax benefit from stock-based compensation (340) (538)
Changes in operating assets and liabilities, net of effects from business acquisition:    
Accounts receivable 18,606 60,259
Inventories (44,446) (24,738)
Prepaid expenses and other assets (10,205) (5,673)
Accounts payable 3,441 (21,060)
Accrued liabilities 4,895 6,805
Income taxes 178 (3,180)
Net cash provided by operations 41,113 85,694
Cash flows from investing activities:    
Proceeds from sales and redemptions of investments 50 57
Additions to property, plant and equipment (24,308) (29,442)
Proceeds from the sale of property, plant and equipment 420 202
Additions to purchased software (698) (855)
Business acquisition, net of cash acquired 0 750
Thailand flood property insurance proceeds 0 550
Other 19 359
Net cash used in investing activities (24,517) (28,379)
Cash flows from financing activities:    
Proceeds from stock options exercised 1,471 10,768
Excess tax benefits from stock-based compensation 340 538
Principal payments on capital lease obligations (327) (281)
Share repurchases (34,558) (11,895)
Net cash used in financing activities (33,074) (870)
Effect of exchange rate changes (1,583) (131)
Net increase (decrease) in cash and cash equivalents (18,061) 56,314
Cash and cash equivalents at beginning of year 427,376 345,555
Cash and cash equivalents at end of period $ 409,315 $ 401,869