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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 $ 328,703 $ 294,632
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 58,894 46,416
Deferred income taxes 2,954 14,534
Stock-based compensation 21,443 16,989
Unrealized (gain) loss on foreign currency transactions (1,779) 8,197
Other (1,936) 699
Provisions for inventory, warranty & bad debt 30,582 34,690
Changes in assets and liabilities that (used) provided cash:    
Accounts receivable (26,058) (56,416)
Inventories (122,051) (39,697)
Prepaid expenses and other current assets (4,925) (1,560)
Accounts payable (1,319) 3,423
Accrued expenses and other liabilities (20,095) 1,809
Income and other taxes payable 15,838 (26,866)
Net cash provided by operating activities 280,251 296,850
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of and deposits on property, plant and equipment (133,355) (99,221)
Proceeds from sales of property, plant and equipment 755 15,437
Purchases of investments (566,498) (146,585)
Proceeds from sales and maturities of investments 286,346 188,143
Acquisitions of businesses, net of cash acquired (4,423) (50,594)
Other 307 (496)
Net cash used in investing activities (416,868) (93,316)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from line-of-credit facilities 255 6,761
Payments on line-of-credit facilities (255) (6,761)
Purchase of noncontrolling interests 0 (197)
Proceeds on long-term borrowings 0 28,000
Principal payments on long-term borrowings (2,696) (18,951)
Proceeds from issuance of common stock under employee stock option and purchase plans less payments for taxes related to net share settlement of equity awards 12,115 23,296
Cash contributed by noncontrolling interests 378 0
Purchase of treasury stock, at cost (111,926) (26,911)
Net cash (used in) provided by financing activities (102,129) 5,237
EFFECT OF CHANGES IN EXCHANGE RATES ON CASH AND CASH EQUIVALENTS (23,548) 47,641
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (262,294) 256,412
CASH AND CASH EQUIVALENTS — Beginning of period 909,900 623,855
CASH AND CASH EQUIVALENTS — End of period 647,606 880,267
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:    
Cash paid for interest 2,402 1,965
Cash paid for income taxes 94,801 118,660
Non-cash transactions:    
Demonstration units transferred from inventory to other assets 3,787 3,290
Inventory transferred to machinery and equipment 2,114 4,087
Changes in accounts payable related to property, plant and equipment $ (3,337) $ (15)