Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Cash received from customers	$ 1,639,136	$ 798,159
Cash paid to suppliers and associates	(1,169,399)	(1,005,181)
Interest received	2,970	6,742
Interest paid	(18,030)	(3,119)
Income tax refunds (payments), net	25,561	(25,643)
Excess tax benefit from share-based compensation arrangements	(66,853)	(16,497)
Other operating activities	(1,050)	(1,296)
Net cash provided by (used in) operating activities	412,335	(246,835)
Cash flows from investing activities:
Purchases of property, plant and equipment	(281,972)	(389,966)
Purchases of marketable securities and investments	(14,446)	(189,735)
Proceeds from sales and maturities of marketable securities and investments	83,367	377,691
Investment in note receivable, affiliate	(21,883)	0
Purchase of restricted investments	(80,667)	(62,748)
Release of (increase in) restricted cash	21,547	(23,328)
Acquisitions, net of cash acquired	(2,437)	(21,105)
Other investing activities	(4,812)	214
Net cash used in investing activities	(301,303)	(308,977)
Cash flows from financing activities:
Proceeds from stock option exercises	70	7,651
Repayments of borrowings under revolving credit facility	(575,000)	0
Proceeds from borrowings under revolving credit facility	590,000	0
Repayments of long-term debt	(160,296)	(114,342)
Proceeds from borrowings under long-term debt, net of discount and issuance costs	0	224,442
Excess tax benefit from share-based compensation arrangements	66,853	16,497
(Repayment of) proceeds from economic development funding	(6,820)	3,112
Other financing activities	(713)	(236)
Net cash (used in) provided by financing activities	(85,906)	137,124
Effect of exchange rate changes on cash and cash equivalents	(505)	10,476
Net increase (decrease) in cash and cash equivalents	24,621	(408,212)
Cash and cash equivalents, beginning of the period	605,619	765,689
Cash and cash equivalents, end of the period	630,240	357,477
Supplemental disclosure of noncash investing and financing activities:
Property, plant and equipment acquisitions funded by liabilities	$ 61,615	$ 109,685