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Debt Obligations, net (Secured Credit Facility Narrative) (Details)	1 Months Ended			3 Months Ended		6 Months Ended	9 Months Ended
	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($) property	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	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				$ 911,000	$ 616,000		$ 3,447,000	$ 4,142,000
2017 Secured Financing | Safety, Income and Growth, Inc.
Line of Credit Facility [Line Items]
Equity capitalization amount, at least				500,000,000			500,000,000
Net worth, at least				250,000,000			$ 250,000,000
2016 Senior Term Loan
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 650,000,000.0	$ 400,000,000.0			400,000,000.0	$ 650,000,000.0		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%
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							$ 2,500,000
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	$ 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%
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
Deferred financing costs			$ 7,300,000

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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