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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended
Aug. 13, 2017
Aug. 14, 2016
Aug. 12, 2015
Feb. 05, 2015
Feb. 28, 2018
Feb. 22, 2017
Feb. 21, 2016
Aug. 19, 2014
Sep. 04, 2014
Subsequent Events (Textual)                  
Dividend distribution of per share $ 0.13 $ 0.085 $ 0.095 $ 0.081   $ 0.085 $ 0.09   $ 0.525
Aggregate dividend value $ 5,779 $ 3,770 $ 4,204 $ 3,582   $ 3,775 $ 3,991   $ 20,111
Dividend paid date Sep. 13, 2017 Sep. 22, 2016 Sep. 10, 2015 Mar. 11, 2015   Apr. 05, 2017 Mar. 17, 2016 Sep. 04, 2014  
Subsequent Event [Member]                  
Subsequent Events (Textual)                  
Dividend distribution of per share         $ 0.13        
Aggregate dividend value         $ 5,784        
Dividend paid date         Mar. 26, 2018