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Debt (Tables)
12 Months Ended
Dec. 31, 2015
Short-term Debt [Line Items]  
Schedule of Long-term Debt Instruments [Text Block]
Long-term debt consists of the following at December 31:

 
 
2015
 
2014
Revolving credit facility
 
$
72,000

 
$

Asset securitization program
 
75,000

 
275,000

3.375% notes, due 2015
 

 
251,955

6.875% senior debentures, due 2018
 
198,886

 
198,424

3.00% notes, due 2018
 
298,197

 
297,408

6.00% notes, due 2020
 
298,932

 
298,680

5.125% notes, due 2021
 
248,566

 
248,287

3.50% notes, due 2022
 
345,061

 

4.50% notes, due 2023
 
296,194

 
295,765

4.00% notes, due 2025
 
344,092

 

7.50% senior debentures, due 2027
 
198,366

 
198,219

Interest rate swaps designated as fair value hedges
 
710

 
378

Other obligations with various interest rates and due dates
 
4,571

 
3,782

 
 
$
2,380,575

 
$
2,067,898

Schedule of Fair Value of Debt [Text Block]
he estimated fair market value at December 31, using quoted market prices, is as follows:

 
 
2015
 
2014
3.375% notes, due 2015
 
$

 
$
255,000

6.875% senior debentures, due 2018
 
218,000

 
232,000

3.00% notes, due 2018
 
303,000

 
309,000

6.00% notes, due 2020
 
330,000

 
339,000

5.125% notes, due 2021
 
267,500

 
277,500

3.50% notes, due 2022
 
343,000

 

4.50% notes, due 2023
 
309,000

 
321,000

4.00% notes, due 2025
 
336,000

 

7.50% senior debentures, due 2027
 
238,000

 
254,000