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. 03, 2017
Jul. 11, 2017
Apr. 25, 2017
Jan. 24, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]              
Dividends Per Share (in dollars per share) $ 0.011 $ 0.01 $ 0.01 $ 0.01 $ 0.041 $ 0.01 $ 0
Total Amount $ 50,388 $ 46,216 $ 46,501 $ 47,137