| Condensed Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares | 3 Months Ended | |||
|---|---|---|---|---|
| Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | |
| Class A Common Stock | ||||
| Common stock dividends, per share | $ 0.16 | $ 0.15 | $ 0.15 | $ 0.15 | 
| X | ||||||||||
| 
- Definition Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Details 
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