Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 4.00% Senior Notes	Jan. 31, 2012 4.00% Senior Notes	Dec. 31, 2011 Senior Notes	Dec. 31, 2010 Senior Notes	Nov. 30, 2009 Senior Notes	Dec. 31, 2011 Revolving Credit Facility	Jun. 30, 2011 Revolving Credit Facility	Dec. 31, 2010 Revolving Credit Facility	Dec. 31, 2011 Receivables Securitization Facility	Dec. 31, 2010 Receivables Securitization Facility	Dec. 31, 2009 Receivables Securitization Facility	Dec. 31, 2011 Notes payable to foreign banks and other debt	Dec. 31, 2010 Notes payable to foreign banks and other debt
Long-Term Debt and Capital Lease Obligations
Long-term debt including current portion	$ 1,377,129	$ 799,992			$ 599,365	$ 599,140		$ 692,400		$ 103,600	$ 81,700	$ 92,000		$ 3,664	$ 5,252
Less current portion	298	352
Total long-term debt	1,376,831	799,640
Average Interest Rate (as a percent)					4.75%			1.55%			2.14%			6.23%
Unamortized discount					635	860
Debt instrument, principal amount				500,000			600,000
Stated interest rate (as a percent)				4.00%	4.75%		4.75%
Debt instrument, face amount, net of discount (as a percent)				99.746%			99.813%
Redemption price as a percentage of principal amount			100.00%
Debt instrument, fair value					643,000
Term of debt (in years)	5 years
Commitment under the Revolving Credit Facility									1,000,000
Borrowings under the Revolving Credit Facility								692,400
Availability under the Revolving Credit Facility								307,600
Interest rate on borrowings under the Revolving Credit Facility, variable rate								LIBOR
Fees and expenses incurred								2,100
Maximum amount of undivided interest, which may be sold by the subsidiary in a designated pool of qualified accounts receivable											100,000
Fees payable under credit facility											1,600	1,500	1,500
Maturity of the Company's long-term debt over each of the next five years
2012	298
2013	81,970
2014	600,165
2015	93
2016	694,603
Long-term debt including current portion	1,377,129	799,992			599,365	599,140		692,400		103,600	81,700	92,000		3,664	5,252
Unused letters of credit	$ 24,900