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Management's Statement: Management Statement (Details) - USD ($)
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 2,614,496,000 $ 2,624,423,000   $ 2,464,069,000 $ 2,419,998,000 $ 2,383,702,000 $ 2,287,423,000
Cumulative Effect, Period of Adoption Adjustment              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest   $ (207,000) $ (200,000)   $ (3,000) $ 3,390,000