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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 206,477 $ 81,272 $ 164,947
Adjustments to reconcile net income from operations to net cash provided by operating activities:      
Depreciation 68,181 73,390 57,317
Amortization 72,592 79,154 93,370
Stock-based compensation 30,451 40,307 36,612
Goodwill impairment   98,897 0
Provision for excess and obsolete inventory 21,332 22,193 16,592
Deferred taxes (7,124) (19,928) (3,316)
Gain from the sale of an equity investment (5,406)   (34,212)
Tax benefit related to employee stock compensation awards (4,715) (535) (2,675)
Non cash charge for the sale of inventories revalued at the date of acquisition 1,567    
Retirement plans actuarial losses (gains) 17,732 46,564 (10,340)
Contingent consideration adjustment 2,489 (630)  
Other (34) 2,874 (5)
Changes in operating assets and liabilities, net of businesses acquired:      
Accounts receivable (57,267) 8,060 (3,656)
Inventories 15,559 51,803 22,282
Prepayments and other assets 3,034 41,537 (49,572)
Accounts payable and other accrued expenses 48,213 (45,430) 15,205
Deferred revenue and customer advances 17,011 22,033 (28,979)
Retirement plan contributions (12,095) (33,916) (5,540)
Income taxes (5,156) 24,417 680
Net cash provided by operating activities 412,841 492,062 268,710
Cash flows from investing activities:      
Purchases of property, plant and equipment (89,878) (168,982) (106,731)
Purchases of available-for-sale marketable securities (1,424,002) (1,578,743) (1,170,506)
Acquisition of businesses, net of cash acquired (282,741) (19,419) (14,999)
Proceeds from maturities of available-for-sale marketable securities 360,264 570,358 516,499
Proceeds from sales of available-for-sale marketable securities 1,316,131 859,729 458,491
Proceeds from (purchases of) life insurance 1,098 4,184 (307)
Proceeds from the sale of an equity investment 5,406   34,212
Net cash used for investing activities (113,722) (332,873) (283,341)
Cash flows from financing activities:      
Issuance of common stock under stock option and stock purchase plans 19,530 21,291 17,596
Repurchase of common stock (299,949)    
Tax benefit related to employee stock compensation awards 4,715 535 2,675
Dividend payments (50,713) (37,425)  
Payment of revolving credit facility costs (2,253)    
Payments of long-term debt   (190,972) (2,534)
Payments of contingent consideration     (388)
Net cash (used for) provided by financing activities (328,670) (206,571) 17,349
(Decrease) increase in cash and cash equivalents (29,551) (47,382) 2,718
Cash and cash equivalents at beginning of year 294,256 341,638 338,920
Cash and cash equivalents at end of year 264,705 294,256 341,638
Cash paid for:      
Interest 301 4,294 8,590
Income taxes $ 35,218 $ 25,893 $ 38,156