Debt (Tables)

3 Months Ended

Mar. 31, 2012

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Text Block]

Long-term debt consists of the following:

	March 31, 2012		December 31, 2011
Revolving credit facility	$	233,700	$	74,000
Asset securitization program	450,000		280,000
6.875% senior notes, due 2013	340,299		341,937
3.375% notes, due 2015	259,779		260,461
6.875% senior debentures, due 2018	198,712		198,660
6.00% notes, due 2020	299,929		299,927
5.125% notes, due 2021	249,297		249,278
7.5% senior debentures, due 2027	197,925		197,890
Other obligations with various interest rates and due dates	20,822		25,670
	$	2,250,463	$	1,927,823

Schedule of Fair Value of Debt [Text Block]

The estimated fair market value, using quoted market prices, is as follows:

	March 31, 2012		December 31, 2011
6.875% senior notes, due 2013	$	352,000	$	352,000
3.375% notes, due 2015	257,500		250,000
6.875% senior debentures, due 2018	236,000		216,000
6.00% notes, due 2020	324,000		315,000
5.125% notes, due 2021	255,000		247,500
7.5% senior debentures, due 2027	220,000		244,000