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Cash Dividend Distribution (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
Oct. 31, 2017
Jul. 31, 2017
May 31, 2017
Mar. 31, 2017
Dividends Payable [Line Items]          
Cash dividends declared   $ 6,624 $ 6,624 $ 6,624 $ 6,624
Cash dividends declared, per share   $ 0.150 $ 0.150 $ 0.150 $ 0.150
First Quarter Previous Year [Member]          
Dividends Payable [Line Items]          
Dividend payable date Apr. 17, 2017        
Dividends payment, date of record Mar. 31, 2017        
Second Quarter Previous Year [Member]          
Dividends Payable [Line Items]          
Dividend payable date Jul. 14, 2017        
Dividends payment, date of record Jun. 30, 2017        
Third Quarter Previous Year [Member]          
Dividends Payable [Line Items]          
Dividend payable date Oct. 16, 2017        
Dividends payment, date of record Sep. 30, 2017        
Fourth Quarter Previous Years [Member]          
Dividends Payable [Line Items]          
Dividend payable date Jan. 12, 2018        
Dividends payment, date of record Dec. 31, 2017