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Debt Obligations, net (Secured Credit Facility Narrative) (Details)
 1 Months Ended 3 Months Ended 7 Months Ended
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
property
Jan. 31, 2017
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
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       $ 372,000 $ 210,000        
2017 Secured Financing                  
Line of Credit Facility [Line Items]                  
Debt instrument, face amount   $ 227,000,000.0     $ 227,000,000.0        
Stated interest rates (as a percent)   3.795%     3.795%        
Number of properties collateralizing loan | property   12              
Deferred financing costs   $ 7,300,000     $ 7,300,000        
2016 Senior Credit Facility                  
Line of Credit Facility [Line Items]                  
Debt instrument, face amount $ 400,000,000.0           $ 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%          
Aggregate price reduction (as a percent) 1.50%                
Multiple of the minimum collateral coverage on outstanding borrowings (at least)       1.25          
Required quarterly principal payment (as a percent)       0.25%          
2016 Senior Credit Facility | Other Expense                  
Line of Credit Facility [Line Items]                  
Loss on early extinguishment of debt, net       $ 400,000          
2016 Senior 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% 3.00%   4.50%      
2016 Senior 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% 0.75%   1.00%      
2016 Senior 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 Revolving Credit Facility                  
Line of Credit Facility [Line Items]                  
Debt instrument, face amount       $ 325,000,000          
Line of credit facility, maximum borrowing capacity $ 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          
Net worth, at least       $ 250,000,000