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Equity - Class of Stock Disclosures - Common Stock and Shelf Registrations (Details) - USD ($)
 9 Months Ended
Jan. 29, 2016
Sep. 30, 2016
Sep. 30, 2015
Aug. 01, 2016
Dec. 31, 2015
Dec. 31, 2013
Equity            
Net proceeds   $ 78,592,000        
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 | Original Agreements            
Equity            
Maximum offering capacity under shelf registration statement         $ 200,000,000  
Shares common stock sold   1,643,017        
Net proceeds   $ 78,600,000        
Reclassification of accumulated costs to additional paid in capital   $ 463,000        
Common Stock | Equity Distribution Agreements            
Equity            
Maximum offering capacity under shelf registration statement       $ 200,000,000    
Shares common stock sold   0        
Amount available under effective shelf registration statement   $ 200,000,000