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Changes in Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019
Dividends declared per share (in dollars per share) | $ 0.19 |  | $ 0.18 | $ 0.38 | $ 0.36 |  |  |
Retained earnings | $ 726,233 |  |  | $ 726,233 |  |  | $ 698,496 |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  | $ (1,400) |  | $ 100
Common Class A [Member] |  |  |  |  |  |  |  |
Dividends declared per share (in dollars per share) | $ 0.19 | $ 0.19 | 0.18 |  | 0.18 |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |
Dividends declared per share (in dollars per share) | $ 0.19 | $ 0.19 | $ 0.18 |  | $ 0.18 |  |  |

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