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Shareholders' Equity (Narrative and Dividends) (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) stock_class vote $ / shares shares | Jun. 30, 2020 $ / shares | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 $ / shares | Sep. 30, 2020 USD ($) stock_class vote $ / shares shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2019 $ / shares shares | Jul. 30, 2018 USD ($)
Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Number of classes of common stock | stock_class | 3 |  |  |  | 3 |  |  |
Preferred stock, authorized shares | 500,000 |  |  |  | 500,000 |  | 500,000 |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  | $ 0.01 |  | $ 0.01 |
Preferred stock, issued shares | 0 |  |  |  | 0 |  | 0 |
Employee stock ownership plan contribution expense | $ | $ 0 |  | $ 0 |  | $ 0 | $ 0 |  |
Cash dividend declared (USD per share) | $ / shares | $ 0.15 | $ 0.15 | $ 0.30 | $ 0.30 |  |  |  |
Common Class A |  |  |  |  |  |  |  |
Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Number of votes | vote | 1 |  |  |  | 1 |  |  |
Common stock, authorized shares | 105,000,000.0 |  |  |  | 105,000,000.0 |  | 105,000,000.0 |
Share repurchase program, authorized amount | $ |  |  |  |  |  |  |  | $ 100,000,000.0
Shares repurchased (in shares) | 0 |  | 0 |  | 0 | 0 |  |
Remaining authorized repurchases | $ | $ 100,000,000.0 |  |  |  | $ 100,000,000.0 |  |  |
Common Class B |  |  |  |  |  |  |  |
Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Number of votes | vote | 10 |  |  |  | 10 |  |  |
Common stock, authorized shares | 80,000,000.0 |  |  |  | 80,000,000.0 |  | 80,000,000.0 |
Common Class C |  |  |  |  |  |  |  |
Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |
Number of votes | vote | 10 |  |  |  | 10 |  |  |
Common stock, authorized shares | 20,000,000.0 |  |  |  | 20,000,000.0 |  | 20,000,000.0 |

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