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Shareholders' Equity (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended | 135 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Feb. 04, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount | $ 69,417 |  |  | $ 69,417 |
Common stock surrendered as payment | 198,563 | $ 166,147 | $ 285,020 | $ 2,600,000 |
Repurchases in Accordance with Stock Award Agreements [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock surrendered as payment | $ 10,420 | $ 5,411 | $ 702 |  |
Subsequent Event [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 100,000

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