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DEBT Senior Unsecured Notes (Tables)
 6 Months Ended
Jun. 30, 2016
Debt Instrument [Line Items]  
Schedule of Debt [Table Text Block]
The maturity and interest rates of the Notes are as follows:
 
Amount
 
Maturity Date
 
Interest Rate
Series A
$
100,000

 
August 20, 2025
 
3.15
%
Series B
100,000

 
August 20, 2030
 
3.35
%
Series C
50,000

 
April 1, 2035
 
3.61
%
Series D
100,000

 
April 1, 2045
 
4.02
%