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Debt - Unsecured Term Loan Facility (Details) - USD ($)
1 Months Ended 9 Months Ended
Aug. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Unsecured revolving credit facility   $ 20,000,000 $ 0
Revolving Credit Facility | Term Loan      
Debt Instrument [Line Items]      
Unsecured revolving credit facility $ 265,000,000 $ 265,000,000 $ 0
Line of credit, remaining borrowing capacity 100,000,000    
Maximum borrowing capacity $ 365,000,000.0    
Derivative, fixed interest rate   2.1485%  
Debt instrument, prepayment premium period one 1.00%    
Debt instrument, prepayment premium, period two 2.00%    
Revolving Credit Facility | Term Loan | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate   1.60%  
Revolving Credit Facility | Term Loan | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.40%    
Revolving Credit Facility | Term Loan | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.35%    
Revolving Credit Facility | Term Loan | Base Rate | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.40%    
Revolving Credit Facility | Term Loan | Base Rate | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.35%