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Equity - Class of Stock Disclosures - Common Stock and Shelf Registrations (Details) - USD ($)
 1 Months Ended 5 Months Ended 6 Months Ended
Jul. 31, 2016
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2013
Equity            
Net proceeds     $ 70,885,000      
Shelf Registration            
Equity            
Maximum offering capacity under shelf registration statement           $ 800,000,000
Automatic shelf registration statement, term (in years)   P3Y        
Common Stock            
Equity            
Number of shares repurchased     49,094 4,609    
Common Stock | Equity Distribution Agreement            
Equity            
Maximum offering capacity under shelf registration statement         $ 200,000,000  
Shares common stock sold     1,490,394      
Net proceeds     $ 70,885,000      
Reclassification of accumulated costs to additional paid in capital     322,000      
Amount available under effective shelf registration statement   $ 127,853,000 $ 127,853,000      
Common Stock | Equity Distribution Agreement | Subsequent Event            
Equity            
Shares common stock sold 152,623          
Net proceeds $ 7,715,000          
Amount available under effective shelf registration statement $ 120,000,000