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Stockholders' Equity (Summary of Regular Quarterly Dividend) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Cash dividend (in usd per share) | $ 0.65 | $ 0.65 | $ 0.65 | $ 0.65 | $ 0.65 | $ 0.60 | $ 1.30 |  | $ 2.55
Payment of dividends |  |  |  |  |  |  | $ 32,670 | $ 31,266 |
Common Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Payment of dividends | $ 16,349 | $ 16,321 | $ 16,280 | $ 16,267 | $ 16,267 | $ 14,999 | $ 32,670 |  | $ 63,813

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