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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:      
Net income (loss) $ 257,692 $ (43,421) $ 206,477
Adjustments to reconcile net income (loss) from operations to net cash provided by operating activities:      
Depreciation 66,122 64,782 68,181
Amortization 41,953 55,227 72,592
Stock-based compensation 34,097 30,750 30,451
Deferred taxes 37,105 (62,936) (7,124)
Provision for excess and obsolete inventory 8,844 17,493 21,332
Contingent consideration fair value adjustment 7,820 15,896 2,489
Retirement plans actuarial (gains) losses (6,624) (3,203) 17,732
Property insurance recovery, net (4,309)    
Goodwill impairment 0 254,946  
Acquired intangible assets impairment   83,339  
Tax benefit related to employee stock compensation awards   (6,198) (4,715)
Gain from the sale of an equity investment     (5,406)
Non-cash charge for the sale of inventories revalued at the date of acquisition     1,567
Other 707 (448) (34)
Changes in operating assets and liabilities, net of businesses acquired:      
Accounts receivable (80,584) 18,325 (57,267)
Inventories 44,960 34,263 15,559
Prepayments and other assets 2,254 (19,194) 3,034
Accounts payable and other accrued expenses 43,574 6,820 58,448
Deferred revenue and customer advances 4,984 (3,634) 17,011
Retirement plan contributions (5,902) (6,044) (12,095)
Income taxes 173,802 18,434 (5,156)
Net cash provided by operating activities 626,495 455,197 423,076
Cash flows from investing activities:      
Purchases of property, plant and equipment (105,375) (85,272) (89,878)
Purchases of available-for-sale marketable securities (1,391,917) (1,656,267) (1,424,002)
Proceeds from maturities of available-for-sale marketable securities 701,681 243,232 360,264
Proceeds from sales of available-for-sale marketable securities 527,746 852,794 1,316,131
Proceeds from property insurance 5,064 5,051  
Acquisition of businesses, net of cash acquired     (282,741)
Proceeds from life insurance     1,098
Proceeds from the sale of an equity investment     5,406
Net cash used for investing activities (262,801) (640,462) (113,722)
Cash flows from financing activities:      
Issuance of common stock under stock purchase and stock option plans 24,493 20,473 19,530
Repurchase of common stock (200,304) (146,331) (299,949)
Dividend payments (55,447) (48,619) (50,713)
Payments related to net settlement of employee stock compensation awards (12,881) (9,398) (10,235)
Payments of contingent consideration (1,050) (11,697)  
Proceeds from issuance of convertible notes, net of issuance costs   450,800  
Purchase of convertible note hedges   (100,834)  
Proceeds from issuance of warrants   67,852  
Tax benefit related to employee stock compensation awards   6,198 4,715
Payment of revolving credit facility costs     (2,253)
Net cash (used for) provided by financing activities (245,189) 228,444 (338,905)
Effects of exchange rate changes on cash and cash equivalents 3,454    
Increase (decrease) in cash and cash equivalents 121,959 43,179 (29,551)
Cash and cash equivalents at beginning of year 307,884 264,705 294,256
Cash and cash equivalents at end of year 429,843 307,884 264,705
Cash paid for:      
Interest 6,446 446 301
Income taxes $ 53,775 $ 40,424 $ 35,218