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Consolidated Statement of Equity (Parentheticals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]      
Dividends on common stock, Per Share $ 2.17 $ 2.05 $ 1.93
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 2,662,647 $ 2,464,069 $ 2,287,423