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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Jul. 31, 2016
May 31, 2016
Apr. 30, 2015
Jun. 30, 2016
Subsequent events        
Procceds from At-the-Market (ATM) program       $ 44,565
Common stock        
Subsequent events        
Shares issued   6,500,000 5,500,000  
ATM        
Subsequent events        
Shares issued       710,000
Procceds from At-the-Market (ATM) program       $ 44,600
Subsequent event | Common stock | Payable In August 2016        
Subsequent events        
Common stock, dividends declared (in dollars per share) $ 0.1995      
Subsequent event | Common stock | Payable In September 2016        
Subsequent events        
Common stock, dividends declared (in dollars per share) 0.2015      
Subsequent event | Class F Preferred Stock        
Subsequent events        
Preferred stock, dividends declared (in dollars per share) $ 0.138021      
Subsequent event | ATM        
Subsequent events        
Shares issued 602,269      
Weighted average share price (in dollars per share) $ 68.43      
Procceds from At-the-Market (ATM) program $ 40,600