LT Debt (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Long-term Debt Instruments [Abstract]

Schedule of Fair Value of Debt [Text Block]

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

	June 30, 2018		December 31, 2017
3.00% notes, due 2018	$	—	$	300,500
6.00% notes, due 2020	218,000		224,000
5.125% notes, due 2021	135,500		139,000
3.50% notes, due 2022	345,500		355,000
4.50% notes, due 2023	304,500		315,500
3.25% notes, due 2024	468,000		491,000
4.00% notes, due 2025	342,500		356,500
7.50% senior debentures, due 2027	131,500		138,500
3.875% notes, due 2028	473,500		501,000

Schedule of Long-term Debt Instruments [Table Text Block]

Long-term debt consists of the following:

	June 30, 2018		December 31, 2017
Revolving credit facility	$	57,700	$	—
Asset securitization program	1,200,000		490,000
6.00% notes, due 2020	209,059		208,971
5.125% notes, due 2021	130,473		130,400
3.50% notes, due 2022	346,899		346,518
4.50% notes, due 2023	297,369		297,122
3.25% notes, due 2024	493,618		493,161
4.00% notes, due 2025	345,469		345,182
7.50% senior debentures, due 2027	109,735		109,694
3.875% notes, due 2028	493,826		493,563
Other obligations with various interest rates and due dates	6,179		18,434
	$	3,690,327	$	2,933,045