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Debt Obligations, net (Secured Credit Facility Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
property
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Aug. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2015
USD ($)
Line of Credit Facility [Line Items]                    
Loss on early extinguishment of debt, net       $ 2,164,000 $ 3,315,000 $ 2,536,000 $ 3,525,000      
2017 Secured Financing                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount     $ 227,000,000.0   $ 227,000,000.0   $ 227,000,000.0      
Stated interest rates (as a percent)     3.795%              
Number of properties collateralizing loan | property     12              
Deferred financing costs     $ 7,300,000              
2016 Senior Term Loan                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount $ 650,000,000.0 $ 400,000,000.0   650,000,000.0   $ 650,000,000.0   $ 500,000,000.0 $ 450,000,000.0  
Percentage of par credit facilities were issued at                 99.00%  
Basis point spread on variable interest rate (as a percent)           1.00%        
Required quarterly principal payment (as a percent)           0.25%        
2016 Senior Term Loan | Other Expense                    
Line of Credit Facility [Line Items]                    
Loss on early extinguishment of debt, net       2,200,000   $ 2,500,000        
2016 Senior Term Loan | London Interbank Offered Rate (LIBOR)                    
Line of Credit Facility [Line Items]                    
Basis point spread on variable interest rate (as a percent) 2.75% 3.00%       2.75%        
2016 Senior Term Loan | London Interbank Offered Rate (LIBOR) | Minimum                    
Line of Credit Facility [Line Items]                    
Basis point spread on variable interest rate (as a percent)   0.75%                
2016 Senior Term Loan | London Interbank Offered Rate (LIBOR) | Maximum                    
Line of Credit Facility [Line Items]                    
Basis point spread on variable interest rate (as a percent)           1.75%        
2015 $325 million Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Line of credit facility, maximum borrowing capacity $ 325,000,000 $ 325,000,000   325,000,000   $ 325,000,000       $ 250,000,000.0
Converted term loan, term           1 year        
Repayments of credit facility           $ 325,000,000        
2015 $325 million Revolving Credit Facility | Minimum                    
Line of Credit Facility [Line Items]                    
Commitment fee percentage           0.30%        
2015 $325 million Revolving Credit Facility | Maximum                    
Line of Credit Facility [Line Items]                    
Commitment fee percentage           0.50%        
2015 $325 million Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                    
Line of Credit Facility [Line Items]                    
Basis point spread on variable interest rate (as a percent)           2.50%        
2015 $325 million Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum                    
Line of Credit Facility [Line Items]                    
Basis point spread on variable interest rate (as a percent)           1.00%        
Safety, Income and Growth, Inc. | 2017 Secured Financing                    
Line of Credit Facility [Line Items]                    
Equity capitalization amount, at least 500,000,000     500,000,000   $ 500,000,000        
Net worth, at least $ 250,000,000     $ 250,000,000   $ 250,000,000