Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Quarterly Dividends (Details)

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Stockholders' Equity - Quarterly Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jul. 18, 2018
Apr. 26, 2018
Jan. 23, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity [Abstract]              
Dividends Per Share (in dollars per share) $ 0.011 $ 0.011 $ 0.011 $ 0.011 $ 0.010 $ 0.033 $ 0.03
Total Amount $ 49,316 $ 49,287 $ 49,397