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Shareholders' Equity (Schedule of Stock by Class) (Details) - $ / shares | Feb. 16, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Class of Stock [Line Items] |  |  |  |
Shares, Issued | 1,006,061 |  |  |
Treasury Stock (shares) |  | 2,700,000 | 2,300,000 |
Common Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.025 | $ 0.025 | $ 0.025
Authorized Shares |  | 80,000,000 | 80,000,000 | 80,000,000
Common Stock Outstanding (shares) |  | 38,100,000 | 38,200,000 | 37,200,000
Treasury Stock (shares) |  | 2,200,000 | 1,800,000 | 2,800,000
Total Issued Shares |  | 40,300,000 | 40,000,000 | 40,000,000
Common Class B |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.025 | $ 0.025 | $ 0.025
Authorized Shares |  | 80,000,000 | 80,000,000 | 80,000,000
Common Stock Outstanding (shares) |  | 13,500,000 | 13,800,000 | 14,200,000
Treasury Stock (shares) |  | 0 | 0 | 800,000
Total Issued Shares |  | 13,500,000 | 13,800,000 | 15,000,000
Common Class C |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.025 | $ 0.025 | $ 0.025
Authorized Shares |  | 20,000,000 | 20,000,000 | 20,000,000
Common Stock Outstanding (shares) |  | 0 | 0 | 0
Treasury Stock (shares) |  | 500,000 | 500,000 | 500,000
Total Issued Shares |  | 500,000 | 500,000 | 500,000

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