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Debt Obligations, net (Secured Credit Facility Narrative) (Details)
 1 Months Ended 6 Months Ended 7 Months Ended
Mar. 31, 2017
USD ($)
lease
property
Jan. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
property
Mar. 31, 2015
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Apr. 14, 2017
USD ($)
Aug. 31, 2016
USD ($)
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              
Number of ground net leases collateralizing loan | lease 7              
Number of master lease collateralizing loan | lease 1              
Number of properties covered under master lease agreement | property 5              
Deferred financing costs $ 7,300,000              
2016 Senior Secured Credit Facility                
Line of Credit Facility [Line Items]                
Debt instrument, face amount     $ 450,000,000.0     $ 450,000,000.0   $ 500,000,000.0
Percentage of par credit facilities were issued at         99.00%      
Basis point spread on variable interest rate (as a percent)         1.00%      
Multiple of the minimum collateral coverage on outstanding borrowings (at least)         1.25      
Required quarterly principal payment (as a percent)         0.25%      
Deferred finance costs, gross           4,500,000    
Debt instrument, thirst party fees, amount recognized           6,200,000    
Debt issuance fees   $ 800,000            
Debt instrument, third party fees, amount capitalized           4,300,000    
2016 Senior Secured Credit Facility | Other Expense                
Line of Credit Facility [Line Items]                
Debt instrument, thirst party fees, amount recognized           $ 1,900,000    
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR)                
Line of Credit Facility [Line Items]                
Basis point spread on variable interest rate (as a percent)         3.75% 4.50%    
2016 Senior Secured 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% 1.00%    
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum                
Line of Credit Facility [Line Items]                
Basis point spread on variable interest rate (as a percent)         2.75%      
2015 $250 Million Secured Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Debt instrument, face amount         $ 250,000,000      
Multiple of the minimum collateral coverage on outstanding borrowings (at least)         1.5      
Line of credit facility, maximum borrowing capacity       $ 250,000,000.0 $ 234,600,000.0      
Converted term loan, term         1 year      
2015 $250 Million Secured Revolving Credit Facility | Minimum                
Line of Credit Facility [Line Items]                
Commitment fee percentage       0.375%        
2015 $250 Million Secured Revolving Credit Facility | Maximum                
Line of Credit Facility [Line Items]                
Commitment fee percentage       0.50%        
2015 $250 Million Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                
Line of Credit Facility [Line Items]                
Basis point spread on variable interest rate (as a percent)         2.75%      
2015 $250 Million Secured 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%      
2016 Secured Term Loan | Secured Debt                
Line of Credit Facility [Line Items]                
Debt instrument, face amount     $ 170,000,000.0     $ 170,000,000.0    
Number of properties collateralizing loan | property     12          
Safety, Income and Growth, Inc. | 2017 Secured Financing                
Line of Credit Facility [Line Items]                
Equity capitalization amount, at least         $ 500,000,000      
Net worth, at least         $ 250,000,000