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Shareholders' Equity (Shareholders' Equity Narrative) (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 16, 2018 USD ($) $ / shares | Oct. 13, 2017 shares | Dec. 31, 2018 USD ($) vote stock_class $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Sep. 06, 2011 USD ($)
Schedule of Shareholders' Equity Activity [Line Items] |  |  |  |  |  |
Number of classes of common stock | stock_class |  |  | 3 |  |  |
Preferred stock authorized (in shares) |  |  | 500,000.0 | 500,000.0 | 500,000 |
Preferred stock, par value (in dollars per shares) | $ / shares |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
Preferred stock issued |  |  | 0 | 0 | 0 |
Purchases of treasury stock | $ |  |  |  |  | $ 8,800,000 |
Share Price | $ / shares | $ 22.18 |  |  |  |  |
Employee stock ownership plan contribution | $ | $ 22,300,000.0 |  | $ 22,300,000 | $ 0 | $ 0 |
Treasury Stock |  |  |  |  |  |
Schedule of Shareholders' Equity Activity [Line Items] |  |  |  |  |  |
Number of shares repurchased |  |  | (1,900,000) | (200,000) | (1,100,000) |
Purchases of treasury stock | $ |  |  | $ 36,700,000 | $ 3,800,000 | $ 8,800,000 |
Cancellation of class B treasury shares |  |  |  | 1,200,000 |  |
Common Class A |  |  |  |  |  |
Schedule of Shareholders' Equity Activity [Line Items] |  |  |  |  |  |
Number of votes per share | vote |  |  | 1 |  |  |
Number of shares repurchased |  |  | 1,871,631 | 200,605 | 984,190 |
Average cost per share (in dollars per share) | $ / shares |  |  | $ 19.59 | $ 18.89 | $ 8.96 |
Purchases of treasury stock | $ |  |  | $ 36,700,000 | $ 3,800,000 |  |
Remaining authorized repurchase amount | $ |  |  | $ 100,000,000 |  |  |
Common Class A | Treasury Stock |  |  |  |  |  |
Schedule of Shareholders' Equity Activity [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount | $ |  |  |  |  |  | $ 100,000,000
Common Class B |  |  |  |  |  |
Schedule of Shareholders' Equity Activity [Line Items] |  |  |  |  |  |
Number of votes per share | vote |  |  | 10 |  |  |
Common Class B | Treasury Stock |  |  |  |  |  |
Schedule of Shareholders' Equity Activity [Line Items] |  |  |  |  |  |
Cancellation of class B treasury shares |  | 1,027,907 |  |  |  |
Class B common stock converted (in shares) |  |  | 284,845 | 136,654 |  |
Common Class C |  |  |  |  |  |
Schedule of Shareholders' Equity Activity [Line Items] |  |  |  |  |  |
Number of votes per share | vote |  |  | 10 |  |  |

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