CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flow from operating activities:
Net income	$ 308,481	$ 269,141
Adjustments for cash from operating activities:
Depreciation and amortization	66,762	58,591
Stock-based compensation expense	17,175	15,101
Excess tax benefits from stock-based compensation payment arrangements	(16,023)	(9,677)
Net change in components of working capital	(26,727)	(40,573)
Net change in other long-term assets and liabilities	11,138	(978)
Cash flow provided by operating activities	360,806	291,605
Cash flow from investing activities:
Additions to property, plant and equipment	(66,037)	(63,422)
Proceeds from disposals of fixed assets	1,412	2,304
Purchases of short-term investments	(408,845)	(142,330)
Sales and maturities of short-term investments	241,605	141,728
Acquisitions, net of cash acquired	(44,036)	(82,349)
Cash flow used in investing activities	(275,901)	(144,069)
Cash flow from financing activities:
Issuance of senior notes		498,730
Borrowings under credit facilities	302,583	436,036
Repayments under credit facilities	(225,842)	(767,900)
Payments of fees and expenses related to debt financing		(4,318)
Proceeds from exercise of stock options	64,204	35,708
Excess tax benefits from stock-based compensation payment arrangements	16,023	9,677
Payments to shareholders of non-controlling interests	(1,736)	(1,650)
Purchase and retirement of treasury stock	(181,108)	(201,020)
Dividend payments	(16,756)	(19,500)
Cash flow used in financing activities	(42,632)	(14,237)
Effect of exchange rate changes on cash and cash equivalents	(9,464)	(2,371)
Net change in cash and cash equivalents	32,809	130,928
Cash and cash equivalents balance, beginning of period	690,850	515,086
Cash and cash equivalents balance, end of period	723,659	646,014
Cash paid for:
Interest	29,737	18,950
Income taxes	$ 82,639	$ 89,481