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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Stockholders' Equity      
Common Stock, Shares, Outstanding 107,231,155   107,231,155
Dividends declared and paid      
Cash dividend declared per share (in dollars per share) $ 0.19 $ 0.19  
Total Dividends $ 20,374 $ 20,374