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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ (4,899) $ 44,460
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation 29,104 27,452
Amortization 10,539 9,139
Provision to doubtful accounts 1,714 1,697
Deferred income taxes 11,863 581
Asset impairments 96 42
Gain on the sale of property, plant and equipment (215) (194)
Stock-based compensation expense 8,229 6,819
Changes in operating assets and liabilities, net of effects from business acquisition:    
Accounts receivable (21,733) 29,229
Contract assets (9,402) (5,373)
Inventories (54,342) (36,747)
Prepaid expenses and other assets 2,493 (8,181)
Accounts payable 12,620 3,922
Accrued liabilities 2,170 15,637
Income taxes (5,530) 1,407
Net cash provided by (used in) operations (17,293) 89,890
Cash flows from investing activities:    
Proceeds from sales of investments at par 522 250
Additions to property, plant and equipment (50,437) (35,033)
Proceeds from the sale of property, plant and equipment 237 270
Additions to purchased software (2,496) (2,703)
Business acquisition, net of cash acquired (2,731) 0
Other (130) (156)
Net cash used in investing activities (55,035) (37,372)
Cash flows from financing activities:    
Proceeds from stock options exercised 3,463 9,828
Employee taxes paid for shares withheld (822) (383)
Dividends paid (14,235) 0
Borrowings under credit agreement 50,000 0
Principal payments on long-term debt and capital lease obligations (107,758) (9,288)
Share repurchases (122,053) (5,887)
Debt issuance costs (2,303) (433)
Net used in financing activities (193,708) (6,163)
Effect of exchange rate changes (797) 2,358
Net increase (decrease) in cash and cash equivalents (266,833) 48,713
Cash and cash equivalents at beginning of year 742,546 681,433
Cash and cash equivalents at end of period $ 475,713 $ 730,146