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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Cash received from customers $ 550,291 $ 589,869
Cash paid to suppliers and employees (507,160) (543,700)
Interest paid, net (459) (378)
Income tax payments, net (4,567) (3,245)
Investment proceeds and miscellaneous receipts, net 4,496 2,158
Proceeds from (payments for) forward foreign exchange contracts, net 342 (4,358)
Net cash provided by operating activities 42,943 40,346
Cash flows from investing activities:    
Capital expenditures (23,629) (27,184)
Proceeds from dispositions of property, plant and equipment 74 18
Proceeds from divestiture of a product line 0 6,919
Payments for acquisitions, net of cash received (16,083) 0
Recovery of (payments for) purchases of intangible assets 7,403 (3)
Payments for purchases of marketable securities and investments (95,375) (61,443)
Proceeds from sales of marketable securities and investments 22,324 17,391
Proceeds from maturities of marketable securities and investments 82,573 45,486
Net cash used in investing activities (22,713) (18,816)
Cash flows from financing activities:    
Payments on long-term borrowings (237) (87)
Payments of contingent consideration (1,433) (1,270)
Proceeds from Issuance of Common Stock 0 3,872
Proceeds from reissuances of treasury stock for share-based compensation, net 3,831 0
Net cash provided by financing activities 2,161 2,515
Effect of foreign exchange rate changes on cash 1,982 (1,383)
Net increase in cash, cash equivalents, and restricted cash 24,373 22,662
Beginning Cash, Cash Equivalents, and Restricted Cash 434,164 384,983
Cash and cash equivalents 455,890 407,272
Restricted Cash, Current 113 90
Restricted Cash, Noncurrent 2,534 283
Ending Cash, Cash Equivalents, and Restricted Cash $ 458,537 $ 407,645