LT Debt (Tables)

9 Months Ended

Sep. 30, 2017

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:

	September 30, 2017		December 31, 2016
6.875% senior debentures, due 2018	$	—	$	212,500
3.00% notes, due 2018	301,500		303,500
6.00% notes, due 2020	226,500		325,500
5.125% notes, due 2021	140,500		265,500
3.50% notes, due 2022	358,000		349,500
4.50% notes, due 2023	318,500		305,500
3.25% notes, due 2024	494,000		—
4.00% notes, due 2025	357,500		345,000
7.50% senior debentures, due 2027	136,500		238,000
3.875% notes, due 2028	499,000		—

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

Long-term debt consists of the following:

	September 30, 2017		December 31, 2016
Revolving credit facility	$	96,200	$	—
Asset securitization program	255,000		460,000
6.875% senior debentures, due 2018	—		199,348
3.00% notes, due 2018	—		299,013
6.00% notes, due 2020	208,928		299,183
5.125% notes, due 2021	130,364		248,843
3.50% notes, due 2022	346,330		345,776
4.50% notes, due 2023	297,001		296,646
3.25% notes, due 2024	492,846		—
4.00% notes, due 2025	345,040		344,625
7.50% senior debentures, due 2027	109,673		198,514
3.875% notes, due 2028	493,449		—
Interest rate swaps designated as fair value hedges	180		152
Other obligations with various interest rates and due dates	27,949		4,234
	$	2,802,960	$	2,696,334