CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flow from operating activities:
Net income	$ 269,141	$ 277,779
Adjustments for cash from operating activities:
Depreciation and amortization	58,591	57,208
Stock-based compensation expense	15,101	13,381
Change in contingent acquisition related obligations		(17,813)
Excess tax benefits from stock-based compensation payment arrangements	(9,677)	(5,493)
Net change in components of working capital	(40,573)	(115,869)
Net change in other long-term assets and liabilities	(978)	3,154
Cash flow provided by operating activities	291,605	212,347
Cash flow from investing activities:
Additions to property, plant and equipment	(63,422)	(46,457)
Proceeds from disposals of fixed assets	2,304	677
Purchases of short-term investments	(142,330)	(69,330)
Sales and maturities of short-term investments	141,728	82,324
Acquisitions, net of cash acquired	(82,349)	(51,889)
Cash flow used in investing activities	(144,069)	(84,675)
Cash flow from financing activities:
Issuance of senior notes	498,730
Borrowings under credit facilities	436,036	489,200
Repayments under credit facilities	(767,900)	(136,821)
Payments of fees and expenses related to debt financing	(4,318)	(2,105)
Proceeds from exercise of stock options	35,708	21,451
Excess tax benefits from stock-based compensation payment arrangements	9,677	5,493
Payment of contingent acquisition related obligations		(40,000)
Payments to shareholders of noncontrolling interests	(1,650)	(27,122)
Purchase and retirement of treasury stock	(201,020)	(360,998)
Dividend payments	(19,500)	(5,241)
Cash flow used in financing activities	(14,237)	(56,143)
Effect of exchange rate changes on cash and cash equivalents	(2,371)	13,791
Net change in cash and cash equivalents	130,928	85,320
Cash and cash equivalents balance, beginning of period	515,086	525,888
Cash and cash equivalents balance, end of period	646,014	611,208
Cash paid for:
Interest	18,950	20,527
Income taxes	$ 89,481	$ 83,496