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Stockholders' Equity (Schedule of Quarterly Dividends Declared and Paid) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 10, 2015 | Jan. 06, 2014 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends paid per share | $ 2.00 | $ 2.00 | $ 0.5 | $ 0.3 | $ 0.3 | $ 0.3 | $ 1.4
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Payments of dividends | $ 48,200 | $ 46,700 | $ 12,359 | $ 7,371 | $ 7,363 | $ 7,344 | $ 34,437

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