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Cash Dividend Distribution (Additional Information) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Feb. 28, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Aug. 04, 2015
Feb. 24, 2015
Dividends Payable [Line Items]                        
Cash dividends approved                       $ 4,548,000
Cash dividends approved, per share                       $ 0.103
Cash dividend distribution   $ 7,330,000               $ 29,318,000    
Cash dividend distribution, per share   $ 0.166               $ 0.664    
Cash dividend declared $ 4,548,000.000 $ 7,330,000 $ 7,330,000 $ 7,330,000 $ 7,330,000              
Cash dividend declared, per share $ 0.103 $ 0.166 $ 0.166 $ 0.166 $ 0.166 $ 0.103 $ 0.166 $ 0.206 $ 0.332      
Dividend payable date               Oct. 15, 2015        
Dividends payment, date of record               Sep. 30, 2015        
Subsequent Events [Member]                        
Dividends Payable [Line Items]                        
Cash dividends approved                     $ 4,548,000  
Cash dividends approved, per share                     $ 0.103  
First Quarter Previous Year [Member]                        
Dividends Payable [Line Items]                        
Dividend payable date               Apr. 15, 2015        
Dividends payment, date of record               Mar. 29, 2015        
Second Quarter Previous Year [Member]                        
Dividends Payable [Line Items]                        
Dividend payable date               Jul. 15, 2015        
Dividends payment, date of record               Jun. 30, 2015        
Third Quarter Previous Year [Member]                        
Dividends Payable [Line Items]                        
Dividend payable date               Oct. 15, 2014        
Dividends payment, date of record               Sep. 30, 2015        
Fourth Quarter Previous Year [Member]                        
Dividends Payable [Line Items]                        
Dividend payable date               Jan. 15, 2015        
Dividends payment, date of record               Dec. 31, 2014        
Fourth Quarter [Member]                        
Dividends Payable [Line Items]                        
Dividend payable date               Jan. 15, 2015        
Dividends payment, date of record               Dec. 31, 2014        
First Quarter [Member]                        
Dividends Payable [Line Items]                        
Dividend payable date               Apr. 15, 2015        
Dividends payment, date of record               Mar. 31, 2015        
Second Quarter [Member]                        
Dividends Payable [Line Items]                        
Dividend payable date               Jul. 15, 2015        
Dividends payment, date of record               Jun. 30, 2015