Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Cash received from customers	$ 431,443	$ 1,125,886
Cash paid to suppliers and associates	(734,225)	(1,028,544)
Interest received	3,617	3,435
Interest paid	(2,305)	(3,723)
Income tax payments	(4,043)	(5,661)
Excess tax benefits from share-based compensation arrangements	(11,680)	(24,933)
Other operating activities	(983)	(5)
Net cash (used in) provided by operating activities	(318,176)	66,455
Cash flows from investing activities:
Purchases of property, plant and equipment	(50,813)	(71,667)
Purchases of marketable securities	0	(75,591)
Proceeds from maturities and sales of marketable securities	33,700	8,775
Payments received on note receivable, affiliate	0	17,075
Change in restricted cash	(1,476)	5,136
Acquisitions, net of cash acquired	0	(7,934)
Purchase of equity and cost method investments	(290)	(14,894)
Other investing activities	(1,502)	(2,500)
Net cash used in investing activities	(20,381)	(141,600)
Cash flows from financing activities:
Repayments of long-term debt	(25,110)	(330,277)
Proceeds from borrowings under long-term debt, net of discount and issuance costs	0	335,000
Excess tax benefit from share-based compensation arrangements	11,680	24,933
Repayment of economic development funding	0	(8,315)
Contingent consideration payments and other financing activities	(448)	14
Net cash (used in) provided by financing activities	(13,878)	21,355
Effect of exchange rate changes on cash and cash equivalents	2,557	(4,751)
Net decrease in cash and cash equivalents	(349,878)	(58,541)
Cash and cash equivalents, beginning of the period	1,325,072	901,294
Cash and cash equivalents, end of the period	975,194	842,753
Supplemental disclosure of noncash investing and financing activities:
Property, plant and equipment acquisitions funded by liabilities	42,933	75,236
Acquisitions funded by liabilities and contingent consideration	$ 584	$ 14,962