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Cash Dividend Distribution (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
May. 04, 2016
Feb. 19, 2016
Nov. 30, 2015
Jul. 31, 2015
Apr. 30, 2015
Feb. 28, 2015
Dividends Payable [Line Items]                
Cash dividends approved       $ 6,624 $ 4,548 $ 4,548 $ 4,548 $ 4,548
Cash dividends approved, per share       $ 0.150 $ 0.103 $ 0.103 $ 0.103 $ 0.103
Cash dividend declared, per share $ 0.150 $ 0.103            
Subsequent Events [Member]                
Dividends Payable [Line Items]                
Cash dividends approved     $ 6,624          
Cash dividends approved, per share     $ 0.150          
First Quarter [Member]                
Dividends Payable [Line Items]                
Dividend payable date Apr. 15, 2016              
Dividends payment, date of record Mar. 31, 2016              
Second Quarter [Member]                
Dividends Payable [Line Items]                
Dividend payable date Jul. 15, 2016              
Dividends payment, date of record Jun. 30, 2016