CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 217,049	$ 369,873	$ 384,820
Less: Income from discontinued operations		1,545	5,128
Less: Gain on disposal of discontinued operations		24,371
Income from continuing operations	217,049	343,957	379,692
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Depreciation	55,049	51,040	52,810
Amortization	87,750	53,338	40,706
Provision for excess and obsolete inventory	26,849	11,601	5,971
Stock-based compensation	39,920	32,337	29,777
Non cash charge for the sale of inventories revalued at the date of acquisition	6,089	12,178
Retirement plans actuarial losses (gains)	23,320	13,564	(1,351)
Contingent consideration adjustment	(8,794)
Tax benefit related to stock options and restricted stock units	(8,358)
Deferred taxes	5,556	(146,949)	(1,519)
Other	498	1,509	2,528
Changes in operating assets and liabilities, net of businesses sold and acquired:
Accounts receivable	(24,093)	66,367	(50,418)
Inventories	17,652	(615)	3,715
Other assets	(1,544)	(22,600)	8,460
Deferred revenue and customer advances	(14,627)	(68,359)	72,744
Accounts payable and other accrued expenses	(32,810)	(48,222)	62,201
Retirement plan contributions	(4,778)	(11,851)	(52,452)
Accrued income taxes	19,804	(8,727)	8,465
Net cash provided by continuing operations	404,532	278,568	561,329
Net cash (used for) provided by discontinued operations		(4,804)	4,957
Net cash provided by operating activities	404,532	273,764	566,286
Cash flows from investing activities:
Purchases of property, plant and equipment	(119,080)	(86,097)	(76,044)
Purchases of available-for-sale marketable securities	(751,129)	(691,802)	(870,777)
Proceeds from maturities of available-for-sale marketable securities	171,054	518,483	136,837
Proceeds from sales of available-for-sale marketable securities	95,215	676,386	154,903
Proceeds from sales of trading marketable securities			26,330
Proceeds from life insurance			1,091
Acquisition of businesses, net of cash acquired		(537,489)
Net cash used for continuing operations	(603,940)	(120,519)	(627,660)
Net cash provided by discontinued operations		39,062
Net cash used for investing activities	(603,940)	(81,457)	(627,660)
Cash flows from financing activities:
Issuance of common stock under stock option and stock purchase plans	18,476	17,385	44,679
Payments of long-term debt	(2,532)	(2,518)	(2,305)
Payments of contingent consideration	(59,710)
Tax benefit related to stock options and restricted stock units	8,358
Repurchase of common stock		(31,175)
Net cash (used for) provided by financing activities	(35,408)	(16,308)	42,374
(Decrease) increase in cash and cash equivalents	(234,816)	175,999	(19,000)
Cash and cash equivalents at beginning of year	573,736	397,737	416,737
Cash and cash equivalents at end of year	338,920	573,736	397,737
Cash paid during the year for:
Interest	8,602	8,645	8,695
Income taxes payments (refunds)	$ 8,084	$ 36,043	$ (2,091)