Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Quarterly Dividends (Details)

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Stockholders' Equity - Quarterly Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Oct. 09, 2018
Jul. 18, 2018
Apr. 26, 2018
Jan. 23, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]              
Dividends Per Share (in dollars per share) $ 0.0121 $ 0.011 $ 0.011 $ 0.011 $ 0.0451 $ 0.041 $ 0.01
Total Amount $ 53,434 $ 49,316 $ 49,287 $ 49,397