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Debt Obligations, net (Secured Credit Facility Narrative) (Details)
 1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
lease
property
Jan. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
property
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
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         $ 616,000 $ 36,000   $ 4,142,000 $ 1,618,000      
2017 Secured Financing                        
Line of Credit Facility [Line Items]                        
Debt instrument, face amount   $ 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 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                
2016 Senior Secured Credit Facility                        
Line of Credit Facility [Line Items]                        
Debt instrument, face amount $ 400,000,000.0       400,000,000.0     400,000,000.0   $ 500,000,000.0 $ 450,000,000.0  
Deferred financing costs $ 2,600,000     $ 6,200,000 2,600,000   6,200,000 2,600,000        
Loss on early extinguishment of debt, net         $ 600,000     $ 800,000        
Percentage of par credit facilities were issued at                     99.00%  
Basis point spread on variable interest rate (as a percent)               1.00%        
Aggregate price reduction (as a percent) 1.50%                      
Multiple of the minimum collateral coverage on outstanding borrowings (at least) 1.25       1.25     1.25        
Required quarterly principal payment (as a percent)               0.25%        
Deferred finance costs, gross             4,500,000          
Debt instrument, third party fees, amount capitalized             4,300,000          
Debt issuance fees     $ 800,000                  
2016 Senior Secured Credit Facility | Other Expense                        
Line of Credit Facility [Line Items]                        
Deferred finance costs, gross $ 1,100,000                      
Debt instrument, thirst party fees, amount recognized $ 1,500,000           $ 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) 3.00%   3.75%       4.50% 3.00%        
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) 0.75%   1.00%       1.00% 0.75%        
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)               2.00%        
2015 $325 Million Secured Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Debt instrument, face amount $ 325,000,000       $ 325,000,000     $ 325,000,000        
Line of credit facility, maximum borrowing capacity $ 325,000,000       325,000,000     $ 325,000,000       $ 250,000,000.0
Converted term loan, term               1 year        
2015 $325 Million Secured Revolving Credit Facility | Minimum                        
Line of Credit Facility [Line Items]                        
Commitment fee percentage 0.30%                      
2015 $325 Million Secured Revolving Credit Facility | Maximum                        
Line of Credit Facility [Line Items]                        
Commitment fee percentage 0.50%                      
2015 $325 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)               2.50%        
2015 $325 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%        
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