CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flow from operating activities:
Net income	$ 469,870	$ 417,941
Adjustments for cash from operating activities:
Depreciation and amortization	101,531	89,339
Stock-based compensation expense	26,584	23,167
Excess tax benefits from stock-based compensation payment arrangements	(18,853)	(17,805)
Net change in components of working capital	(24,249)	(44,789)
Net change in other long-term assets and liabilities	2,841	(250)
Cash flow provided by operating activities	557,724	467,603
Cash flow from investing activities:
Additions to property, plant and equipment	(105,740)	(96,489)
Proceeds from disposals of fixed assets	2,084	4,174
Purchases of short-term investments	(538,152)	(220,330)
Sales and maturities of short-term investments	395,590	186,833
Acquisitions, net of cash acquired	(44,036)	(179,597)
Cash flow used in investing activities	(290,254)	(305,409)
Cash flow from financing activities:
Issuance of senior notes		498,730
Borrowings under credit facilities	490,800	606,600
Repayments under credit facilities	(327,043)	(876,960)
Payments of fees and expenses related to debt financing	(2,710)	(4,318)
Proceeds from exercise of stock options	79,587	73,450
Excess tax benefits from stock-based compensation payment arrangements	18,853	17,805
Payments to shareholders of non-controlling interests	(4,371)	(4,713)
Purchase and retirement of treasury stock	(296,975)	(229,442)
Dividend payments	(33,472)	(36,385)
Cash flow (used in) provided by financing activities	(75,331)	44,767
Effect of exchange rate changes on cash and cash equivalents	6,377	3,499
Net change in cash and cash equivalents	198,516	210,460
Cash and cash equivalents balance, beginning of period	690,850	515,086
Cash and cash equivalents balance, end of period	889,366	725,546
Cash paid for:
Interest	42,840	31,791
Income taxes	$ 126,744	$ 134,479