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Debt - Unsecured Revolving Credit Facility (Details)
Jan. 23, 2015
USD ($)
option
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Line of Credit Facility [Line Items]      
Unsecured revolving credit facility   $ 35,192,000 $ 0
Secured Revolving and Term Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Write off of deferred debt financing costs $ 1,300,000    
Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Current borrowing capacity 800,000,000.0    
Maximum borrowing capacity $ 1,250,000,000.00    
Unsecured revolving credit facility   $ 40,000,000 $ 0
Debt Instrument, Option to Extend, Number | option 2    
Extension period 6 months    
Extension fee percent of outstanding commitments under revolving credit facility 0.075%    
Maximum leverage ratio 60.00%    
Consolidated Secured Indebtedness to Total Asset Value 40.00%    
Line of Credit Facility, Covenant Compliance, Minimum Tangible Net Worth $ 745,400,000.0    
Percent of Net Equity Proceeds Received 75.00%    
Line of Credit Facility, Covenant Compliance, Minimum Adjusted EBITDA to Consolidated Fixed Charges 1.50    
Net Operating Income to Unsecured Debt 1.75    
Covenant Compliance, Ratio of Total Unsecured Debt to Unencumbered Asset Value 60.00%    
Covenant Compliance, Consolidated Secured Recourse Debt to Asset Value 10.00%    
Eurodollar [Member] | Minimum [Member] | Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 0.875%    
Eurodollar [Member] | Maximum [Member] | Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.60%    
Base Rate [Member] | Minimum [Member] | Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 0.00%    
Base Rate [Member] | Maximum [Member] | Unsecured Revolving Credit Facility [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 0.60%