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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Cash received from customers $ 2,093,948 $ 2,074,024 $ 1,956,084
Cash paid to suppliers and employees (1,918,971) (1,810,844) (1,730,062)
Interest paid (21,124) (21,318) (20,793)
Income tax payments (52,136) (38,442) (31,715)
Investment proceeds and miscellaneous receipts, net 19,892 15,683 11,953
Excess tax benefits from share-based compensation 0 (1,506) (3,610)
(Payments for) proceeds from forward foreign exchange contracts, net (17,724) (1,164) 4,353
Net cash provided by operating activities 103,885 216,433 186,210
Cash flows from investing activities:      
Capital expenditures (111,332) (141,436) (112,000)
Proceeds from dispositions of property, plant and equipment 86 398 79
Payments for acquisitions, net of cash received, and long-term investments (76,645) (14,165) (4,356)
Payments for purchases of intangible assets (3,795) (135) (1,372)
Payments for purchases of restricted investment (1,000) (350) (4,210)
Payments for purchases of marketable securities and investments (282,656) (278,071) (294,497)
Proceeds from sales of marketable securities and investments 97,523 76,859 78,664
Proceeds from maturities of marketable securities and investments 202,247 143,020 170,823
Net cash used in investing activities (175,572) (213,880) (166,869)
Cash flows from financing activities:      
Net (payments) borrowings on line-of-credit arrangements and notes payable (36) 37 0
Payments on long-term borrowings (316) (303) (282)
Proceeds from issuance of common stock 7,294 11,280 8,236
Payments for Repurchase of Common Stock (2,920) 0 0
Payment for Contingent Consideration Liability, Financing Activities 3,681 3,500 2,983
Excess tax benefits from share-based compensation 0 1,506 3,610
Net cash provided by financing activities 341 9,020 8,581
Effect of foreign exchange rate changes on cash (1,094) (12,858) 16,376
Net (decrease) increase in cash and cash equivalents (72,440) (1,285) 44,298
Cash and cash equivalents at beginning of year 456,264 457,549 413,251
Cash and cash equivalents at end of year $ 383,824 $ 456,264 $ 457,549