CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 81,272us-gaap_NetIncomeLoss	$ 164,947us-gaap_NetIncomeLoss	$ 217,049us-gaap_NetIncomeLoss
Adjustments to reconcile income from operations to net cash provided by operating activities:
Depreciation	73,390us-gaap_Depreciation	57,317us-gaap_Depreciation	55,049us-gaap_Depreciation
Amortization	79,154us-gaap_AdjustmentForAmortization	93,370us-gaap_AdjustmentForAmortization	90,465us-gaap_AdjustmentForAmortization
Stock-based compensation	40,307us-gaap_ShareBasedCompensation	36,612us-gaap_ShareBasedCompensation	39,920us-gaap_ShareBasedCompensation
Goodwill impairment	98,897us-gaap_GoodwillImpairmentLoss
Provision for excess and obsolete inventory	22,193us-gaap_InventoryWriteDown	16,592us-gaap_InventoryWriteDown	26,849us-gaap_InventoryWriteDown
Deferred taxes	(4,411)us-gaap_DeferredIncomeTaxExpenseBenefit	(4,284)us-gaap_DeferredIncomeTaxExpenseBenefit	5,556us-gaap_DeferredIncomeTaxExpenseBenefit
Gain from the sale of an equity investment		(34,212)
Tax benefit related to stock options and restricted stock units	(535)	(2,675)	(8,490)
Non cash charge for the sale of inventories revalued at the date of acquisition			6,089us-gaap_OtherNoncashExpense
Retirement plans actuarial losses (gains)	46,564	(10,340)	23,320
Contingent consideration adjustment	(630)		(8,761)
Other	3,505us-gaap_OtherNoncashIncomeExpense	1,107us-gaap_OtherNoncashIncomeExpense	(2,250)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of businesses acquired:
Accounts receivable	8,060	(3,656)	(24,093)
Inventories	51,172us-gaap_IncreaseDecreaseInInventories	21,170us-gaap_IncreaseDecreaseInInventories	17,652us-gaap_IncreaseDecreaseInInventories
Prepayments and other assets	41,537	(49,572)	(2,995)
Accounts payable and other accrued expenses	(45,430)	15,205	(32,810)
Deferred revenue and customer advances	22,033	(28,979)	(14,627)
Retirement plan contributions	(33,916)	(5,540)	(4,778)
Accrued income taxes	8,900	1,648	19,804
Net cash provided by operating activities	492,062	268,710	402,949
Cash flows from investing activities:
Purchases of property, plant and equipment	(168,982)	(106,731)	(119,080)
Purchases of available-for-sale marketable securities	(1,578,743)	(1,170,506)	(748,229)
Acquisition of businesses, net of cash acquired	(19,419)	(14,999)
Proceeds from maturities of available-for-sale marketable securities	570,358	516,499	225,085
Proceeds from sales of available-for-sale marketable securities	859,729	458,491	38,284
Proceeds from (purchases of) life insurance	4,184	(307)	1,451
Proceeds from the sale of an equity investment		34,212
Net cash used for investing activities	(332,873)	(283,341)	(602,489)
Cash flows from financing activities:
Issuance of common stock under stock option and stock purchase plans	21,291	17,596	18,477
Tax benefit related to stock options and restricted stock units	535	2,675	8,490
Dividend payments	(37,425)us-gaap_PaymentsOfDividends
Payments of long-term debt	(190,972)us-gaap_RepaymentsOfLongTermDebt	(2,534)us-gaap_RepaymentsOfLongTermDebt	(2,533)us-gaap_RepaymentsOfLongTermDebt
Payments of contingent consideration		(388)	(59,710)
Net cash (used for) provided by financing activities	(206,571)	17,349	(35,276)
(Decrease) increase in cash and cash equivalents	(47,382)	2,718	(234,816)
Cash and cash equivalents at beginning of year	341,638	338,920	573,736
Cash and cash equivalents at end of year	294,256	341,638	338,920
Cash paid during the year for:
Interest	4,294us-gaap_InterestPaid	8,590us-gaap_InterestPaid	8,602us-gaap_InterestPaid
Income taxes	$ 25,893us-gaap_IncomeTaxesPaidNet	$ 38,156us-gaap_IncomeTaxesPaidNet	$ 8,084us-gaap_IncomeTaxesPaidNet

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Other expenses or losses included in net income that result in no cash outflows or inflows in the period and are not separately disclosed.

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The net cash outflow or inflow for net proceeds and payments derived from carrying life insurance policies for which the entity is the beneficiary.

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-Publisher FASB

-Name Accounting Standards Codification

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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