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Stockholders' Equity (Summary of Regular Quarterly Dividend) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cash dividend (in usd per share) | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.55 | $ 2.35
Payment of dividends | $ 14,999 |  |  |  | $ 13,858 |
Common Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Payment of dividends | $ 14,999 | $ 15,156 | $ 15,129 | $ 15,127 | $ 13,858 | $ 59,270

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