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Consolidated Statements Of Income (Parenthetical) | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Capital Notes 6% Due 4/1/2017 [Member] |  |
Capital notes, interest rate |  | 6.00%
Capital notes, maturity date |  | Apr. 01, 2017
Capital Notes 4% Due 1/24/2022 [Member] |  |
Capital notes, interest rate | 4.00% |
Capital notes, maturity date | Jan. 24, 2022 |

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