Debt (Tables)

6 Months Ended

Jun. 30, 2012

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Text Block]

Long-term debt consists of the following:

	June 30, 2012		December 31, 2011
Revolving credit facility	$	191,800	$	74,000
Asset securitization program	200,000		280,000
6.875% senior notes, due 2013	338,661		341,937
3.375% notes, due 2015	259,096		260,461
6.875% senior debentures, due 2018	198,764		198,660
6.00% notes, due 2020	299,931		299,927
5.125% notes, due 2021	249,317		249,278
7.5% senior debentures, due 2027	197,960		197,890
Other obligations with various interest rates and due dates	22,344		25,670
	$	1,957,873	$	1,927,823

Schedule of Fair Value of Debt [Text Block]

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

	June 30, 2012		December 31, 2011
6.875% senior notes, due 2013	$	348,700	$	352,000
3.375% notes, due 2015	257,500		250,000
6.875% senior debentures, due 2018	234,000		216,000
6.00% notes, due 2020	330,000		315,000
5.125% notes, due 2021	262,500		247,500
7.5% senior debentures, due 2027	226,000		244,000