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Changes in Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Dividends declared per share | $ 0.18 | $ 0.17 |
Common Class A [Member] |  |  |
Dividends declared per share | 0.18 | 0.17 |
Common Class B [Member] |  |  |
Dividends declared per share | $ 0.18 | $ 0.17 |
ASC 606 [Member] |  |  |
Increase decrease in retained earnings |  |  | $ 5,600
Increase decrease in non controlling interest |  |  | 300
ASU 2016-16 [Member] |  |  |
Increase decrease in retained earnings |  |  | 500
ASC 842 [Member] |  |  |
Increase decrease in retained earnings |  |  | $ 100

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