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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Aug. 31, 2006
ASC 606 [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Increase decrease in retained earnings |  |  | $ 5.6 |  |
Increase decrease in non controlling interest |  |  | 0.3 |  |
ASU 2016-16 [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Increase decrease in retained earnings |  |  | $ 0.5 |  |
ASC 842 [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Increase decrease in retained earnings |  | $ 0.1 |  |  |
Common Class A [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends declared per share amount |  | $ 0.69 | $ 0.68 | $ 0.73 |
Common Stock, par value per share |  | 0.001 |  | $ 0.001 |
Common Stock reserved for the conversion of Class B Common Stock and the exercise of stock options |  |  |  | 1.6 |
Number of shares authorized to be repurchased |  |  |  |  | 2.0
Common Class A [Member] | Public offering [Member] | Number of Shares Reduced [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common Stock reserved for the conversion of Class B Common Stock and the exercise of stock options |  |  |  | 1.6 |
Common Class B [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends declared per share amount |  | 0.69 | $ 0.68 | $ 0.73 |
Common Stock, par value per share |  | $ 0.001 |  | $ 0.001 |
Common Class B [Member] | Standish Family Holdings, LLC [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Conversion of stock | 1.6 |  |  |  |

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