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Common stock Preferred stock and additional paid in capital-Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended 10 Months Ended
May. 13, 2015
Jan. 22, 2014
Apr. 13, 2015
Mar. 27, 2012
Jun. 30, 2015
Jun. 30, 2014
Jul. 11, 2010
Aug. 07, 2013
Jul. 20, 2010
Oct. 19, 2012
Nov. 04, 2010
Oct. 19, 2010
Mar. 31, 2015
Jul. 12, 2010
Preferred Stock Shares Issued           6,000,000                
Common Stock, Preferred Stock Issuance, value         $ 5,383                  
Common stock shares issued         149,600               149,600  
Common stock shares par value         $ 0.0001               $ 0.0001  
Dividends paid         $ (48,836) $ (45,029)                
Issuance of four million Series C Cumulative Redeemable Perpetual Preferred Stock [Member]                            
Dividend per share   $ 2.125                        
Preferred Stock Shares Issued   4,000,000                        
Preferred stock dividend rate   8.50%                        
Preferred Stock, Redemption Terms   At any time after January 21, 2019, the Series C Preferred Stock may be redeemed, at Company's election at a price of $25 of liquidation preference per share.                        
Public offering per share price   $ 25                        
Follow-on offering proceeds, net   $ 96,523                        
Follow-on offering completion [Member]                            
Common stock shares issued during period       7,500,000                    
Common stock shares issued       67,800,000                    
Common stock shares par value       $ 0.0001                    
Public offering per share price       $ 14.1                    
Follow-on offering proceeds, net       $ 100,584                    
October fifteen to January fourteen Series B Preferred Dividends paid [Member]                            
Dividends paid           $ 953                
Dividends paid, per common share           $ 0.476563                
January fifteen to April fourteen cy Series B Preferred Dividends paid [member]                            
Dividends paid           $ 953                
Dividends paid, per common share           $ 0.476563                
January to April cy Series C Preferred Dividends paid [Member]                            
Dividends paid         $ 2,125 $ 1,983                
Dividends paid, per common share         $ 0.531250 $ 0.495833                
October fifteen to January fourteen Series B Preferred Dividends paid [Member]                            
Dividends paid         $ 953                  
Dividends paid, per common share         $ 0.476563                  
October to January cy Series C Preferred Dividends paid [Member]                            
Dividends paid         $ 2,125                  
Dividends paid, per common share         $ 0.531250                  
First Quarter Cy Dividends paid [Member]                            
Dividends paid         $ 21,736 $ 20,944                
Dividends paid, per common share         $ 0.28 $ 0.28                
Fourth Quarter Py Dividends paid [Member]                            
Dividends paid         $ 20,944 $ 20,196                
Dividends paid, per common share         $ 0.28 $ 0.27                
January to April cy Series B Preferred Dividends paid [Member]                            
Dividends paid     $ 953                      
Dividends paid, per common share     $ 0.476563                      
Companys authorized capital stock [Member]                            
Common stock authorization date                 July 14, 2010          
Common stock shares authorized             2,000,000              
Stock split date                       August 27, 2010    
Common stock shares issued during period             1,000,000   24,000,000     22,000,000    
Dividend per share                       $ 0.88    
Common Stock, Preferred Stock Issuance, value                 $ 2,400          
Common stock shares issued                 25,000,000          
Common stock shares par value             $ 0.0001              
Issuance of two million Series B Cumulative Redeemable Perpetual Preferred Stock [Member]                            
Dividend per share               $ 1.90625            
Preferred Stock Shares Issued               2,000,000            
Preferred stock dividend rate               7.625%            
Preferred Stock, Redemption Terms               At any time after August 6, 2018, the Series B Preferred Stock may be redeemed, at Company's election at a price of $25 of liquidation preference per share.            
Public offering per share price               $ 25            
Follow-on offering proceeds, net               $ 48,042            
Second follow-on offering completion [Member]                            
Common stock shares issued during period                   7,000,000        
Common stock shares issued                   74,800,000        
Common stock shares par value                   $ 0.0001        
Public offering per share price                   $ 14        
Follow-on offering proceeds, net                   $ 93,547        
Companys Ipo completion [Member]                            
Common stock shares issued during period                     13,300,000      
Common stock shares issued                     60,300,000      
Common stock shares par value                     $ 0.0001      
Public offering per share price                     $ 12      
Initial Public offering proceeds, net                     $ 145,543      
Authorized capital stock (amended articles incorporation) [Member]                            
Common stock shares authorized                           1,000,000,000
Common stock shares par value                           $ 0.0001
Preferred Stock, Shares Authorized                           100,000,000
Preferred stock shares designated as Series A Participating Preferred Stock                           10,000,000
Preferred stock shares par value                           $ 0.0001
Series D Preferred Stock [Member]                            
Dividend per share $ 2.1875                          
Preferred Stock Shares Issued 4,000,000                          
Preferred stock dividend rate 8.75%                          
Preferred Stock, Redemption Terms At any time after May 13, 2020, the Series D Preferred Stock may be redeemed, at the Company’s election at a price of $25 of liquidation preference per share.                          
Public offering per share price $ 25                          
Follow-on offering proceeds, net $ 96,616