Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of assets pledged to secure a debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Face (par) amount of the original debt instrument that was repurchased.

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No definition available.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Nominal or face amount used to calculate payment on derivative.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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The amount of gain reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Amount of restricted investment in debt security measured at amortized cost (held-to-maturity).

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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No definition available.

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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of a type of municipal bond typically used to fund a development project. Also called special assessment limited liability bond, special district bond, special purpose bond, special tax bond and community development obligation. Interest owed to lenders is paid by taxes levied on the community benefiting from the particular bond-funded project. For example, if a bond of this sort was issued to pay for sidewalks to be repaved in a certain community, an additional tax would be levied on homeowners in the area benefiting from this project.

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Debt Coverage Ratio

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No definition available.

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Potential 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 if the accordion feature is utilized.

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Line of Credit Facility, Competitive Bid Amount

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Line of Credit Facility, Extension Period

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Line of Credit Facility, Number of Extensions

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Non cash debt related items such as above/below market assumed mortgage intangibles

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Number of Interest Rate Derivatives Terminated

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Debt (Narrative) (Details) $ in Thousands			9 Months Ended		12 Months Ended
Debt (Narrative) (Details) $ in Thousands	Jul. 01, 2019 USD ($)	Mar. 30, 2016 USD ($) debt_extension	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) derivative_contract	Mar. 27, 2019 USD ($)	Jan. 01, 2019 USD ($)
Debt Instrument [Line Items]
Debt service guaranty liability			$ 60,900		$ 60,900
Principal payments of debt			54,226	$ 255,472
Gain (loss) on extinguishment of debt					400
Debt instruments collateral value			500,000		$ 600,000
Finance lease obligation			21,828				$ 21,900
Net premium/(discount) on debt			(4,100)
Deferred finance costs, net			(5,800)
Non-cash debt			1,500
Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility		$ 500,000
Number of credit facility 6-month extensions \| debt_extension		2
Line of credit facility, extension period		6 months
Bids amount (up to)			250,000
Maximum increase in credit facility amount (up to)			$ 850,000
Commitment fee percentage			0.15%		0.15%
Debt Service Guaranty [Member]
Debt Instrument [Line Items]
Debt coverage ratio			1.4
Mortgages [Member]
Debt Instrument [Line Items]
Principal payments of debt	$ 50,000
Debt stated interest rate	7.00%
Par Value Debt [Member]
Debt Instrument [Line Items]
Principal payments of debt					$ 51,000
Short-Term Unsecured Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility						$ 10,000
Fixed interest rate loan period (in days)			30 days		30 days
Commitment fee percentage			0.10%		0.10%
Unused capacity, commitment fee percentage			0.05%		0.05%
Unsecured Variable-Rate Term Loan [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, repurchased face amount					$ 200,000
Debt instrument, interest rate, effective percentage					2.50%
London Interbank Offered Rate (LIBOR) [Member] \| Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.90%		0.90%
Thirty-Day LIBOR [Member] \| Short-Term Unsecured Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.25%		1.25%
Financial Standby Letter of Credit [Member]
Debt Instrument [Line Items]
Securities pledged as collateral			$ 5,300		$ 5,200
Guarantor obligations, maximum exposure, undiscounted			$ 5,000		$ 5,000
Interest Rate Contract [Member] \| Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Number of interest rate derivatives terminated \| derivative_contract					3
Notional amount of interest rate fair value hedge derivatives					$ 200,000
Gain due to the probability that the related hedged forecasted transactions would no longer occur					$ 3,400