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Consolidated Statements Of Cash Flows (Parenthetical)
6 Months Ended
Jun. 30, 2020
Capital Notes 3.25% Due 6/30/2025 [Member]  
Capital notes, interest rate 3.25%
Capital notes, maturity date Jun. 30, 2025
Capital Notes 6% Due 4/1/2017 [Member]  
Capital notes, interest rate 4.00%
Capital notes, maturity date Jan. 24, 2022