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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Cash received from customers $ 589,869 $ 508,982
Cash paid to suppliers and employees (543,700) (550,289)
Interest (paid), received, net (378) 54
Income tax payments, net (3,245) (8,804)
Investment proceeds and miscellaneous receipts, net 2,158 1,283
Payments for forward foreign exchange contracts, net (4,358) (7,429)
Net cash provided by (used in) operating activities 40,346 (56,203)
Cash flows from investing activities:    
Capital expenditures (27,184) (39,332)
Proceeds from dispositions of property, plant and equipment 18 15
Proceeds from divestiture of a product line 6,919 0
Payments for acquisitions and long-term investments 0 (73,541)
Payments for purchases of intangible assets (3) 0
Payments for purchases of marketable securities and investments (61,443) (68,305)
Proceeds from sales of marketable securities and investments 17,391 20,201
Proceeds from maturities of marketable securities and investments 45,486 50,570
Net cash used in investing activities (18,816) (110,392)
Cash flows from financing activities:    
Net payments on line-of-credit arrangements and notes payable 0 (36)
Payments on long-term borrowings (87) (76)
Payments of contingent consideration (1,270) (3,105)
Proceeds from issuance of common stock for shared-based compensation 3,872 3,890
Net cash provided by financing activities 2,515 673
Effect of foreign exchange rate changes on cash (1,383) 1,338
Net increase (decrease) in cash, cash equivalents, and restricted cash 22,662 (164,584)
Cash and cash equivalents 407,272 291,663
Cash, Cash Equivalents, and Restricted Cash 407,645 292,587
Restricted Cash, Current 90 505
Restricted Cash, Noncurrent $ 283 $ 419