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DEBT Senior Unsecured Notes (Tables) | 3 Months Ended
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Mar. 31, 2018
Senior Notes 2016 [Member] |
Debt Instrument [Line Items] |
Schedule of Debt [Table Text Block] | The maturity and interest rates of the 2016 Notes are as follows:
| Amount |  | Maturity Date |  | Interest Rate
Series A | $ | 100,000 |  |  | October 20, 2028 |  | 2.75 | %
Series B | 100,000 |  |  | October 20, 2033 |  | 3.03 | %
Series C | 100,000 |  |  | October 20, 2037 |  | 3.27 | %
Series D | 50,000 |  |  | October 20, 2041 |  | 3.52 | %
Senior Notes 2015 [Member] |
Debt Instrument [Line Items] |
Schedule of Debt [Table Text Block] | The maturity and interest rates of the 2015 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 | %

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