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Subsequent Events (Details) - $ / shares
3 Months Ended
Apr. 06, 2018
Mar. 31, 2018
Mar. 31, 2017
Subsequent Events      
Cash dividend declared per share (in dollars per share)   $ 0.19 $ 0.19
Cash distribution declared | Subsequent Events.      
Subsequent Events      
Cash dividend declared per share (in dollars per share) $ 0.09