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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