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Stockholders' Equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jul. 13, 2018
May 17, 2018
Jun. 30, 2018
Jun. 30, 2017
Dividends Payable [Line Items]        
Quarterly cash dividend (in dollars per share)   $ 0.16 $ 0.32 $ 0.32
Amount of quarterly cash dividend declared   $ 25.7    
Subsequent Event        
Dividends Payable [Line Items]        
Quarterly cash dividend (in dollars per share) $ 0.16