Percentage of partner's interest in asset acquired.

No definition available.

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- Definition

Maximum period of time (in years) for liquidity requirements to be considered short term.

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- Definition

Percentage of amount that exceeds the outstanding principal of the first mortgage note and the funds deposited into escrow, including a stated return on such funds.

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No definition available.

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Stated return on funds deposited in escrow.

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- Definition

The undepreciated book value of real estate assets that are used to secure certain mortgages and notes payable.

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No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

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

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No definition available.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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Face (par) amount of debt instrument at time of issuance.

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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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No definition available.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount, after accumulated amortization, of debt discount.

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

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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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Gross amount of debt extinguished.

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No definition available.

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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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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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Date the credit facility terminates, in CCYY-MM-DD format.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Mortgages and Notes Payable (Details) - USD ($)	3 Months Ended				9 Months Ended		12 Months Ended
Mortgages and Notes Payable (Details) - USD ($)	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2016
Debt Instrument [Line Items]
Mortgages and notes payable	$ 1,966,398,000				$ 1,966,398,000			$ 1,948,047,000
Unamortized debt issuance costs	(8,262,000)				(8,262,000)			(6,302,000)
Gains on debt extinguishment	$ 0			$ 0	826,000	$ 0
Maximum liquidity requirements (in years)	1 year
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity on revolving credit facility	$ 475,000,000				475,000,000
Maturity date on revolving credit facility	Jan. 01, 2018
Annual facility fee (in hundredths)	0.20%
Amount outstanding on revolving credit facility	$ 72,000,000				72,000,000
Outstanding letters of credit on revolving credit facility	600,000				600,000
Unused borrowing capacity on revolving credit facility	$ 402,400,000				402,400,000
5.10%(4.22% effective rate) Mortgage Loan due 2017 [Member]
Debt Instrument [Line Items]
Early repayment of debt		$ 108,200,000
Effective interest rate (in hundredths)		4.22%
Scheduled maturity date		Nov. 01, 2017
Gains on debt extinguishment		$ 400,000
6.11% (5.36% effective rate) Mortgage Loan due 2017 (Note A) [Member]
Debt Instrument [Line Items]
Early repayment of debt		18,000,000.0
Effective interest rate (in hundredths)							5.36%
Scheduled maturity date							Jul. 06, 2017
Percentage of partner's interest in asset acquired (in hundredths)							77.20%
Principal debt amount							$ 18,000,000
6.11% (8.60% effective rate) Mortgage Loan due 2017 (Note B) [Member]
Debt Instrument [Line Items]
Early repayment of debt		500,000
Effective interest rate (in hundredths)							8.60%
Scheduled maturity date							Jul. 06, 2017
Gains on debt extinguishment		$ 400,000
Principal debt amount							$ 10,200,000
Percentage of excess funds after waterfall payments (in hundredths)							50.00%
Stated return on funds deposited in escrow (in hundredths)							10.00%
Projected waterfall payment							$ 1,000,000
4.0% Mortgage Loan due May 2029 [Member]
Debt Instrument [Line Items]
Effective interest rate (in hundredths)		4.00%
Scheduled maturity date		May 01, 2029
Principal debt amount		$ 100,000,000
Debt issuance costs incurred		800,000
3.875% (4.038% effective rate) Notes due 2027 [Member]
Debt Instrument [Line Items]
Effective interest rate (in hundredths)			4.038%
Scheduled maturity date			Mar. 01, 2027
Debt issuance costs incurred			$ 2,500,000
Original issue discount			4,000,000
5.85% (5.88% effective rate) Notes due 2017 [Member]
Debt Instrument [Line Items]
Principal debt amount			$ 379,700,000
Interest rate (in hundredths)			5.85%
Variable Rate Term Loan due 2022 [Member]
Debt Instrument [Line Items]
Principal debt amount			$ 150,000,000
Variable Rate Term Loan (amended) due 2022 [Member]
Debt Instrument [Line Items]
Scheduled maturity date			Jan. 01, 2022
Principal debt amount			$ 200,000,000
Debt issuance costs incurred			$ 300,000
7.50% Notes due 2018 [Member]
Debt Instrument [Line Items]
Scheduled maturity date	Apr. 15, 2018
Principal debt amount	$ 200,000,000				200,000,000
Secured indebtedness [Member]
Debt Instrument [Line Items]
Mortgages and notes payable	99,421,000				99,421,000			128,204,000
Aggregate undepreciated book value of secured real estate assets	147,700,000				147,700,000
Unsecured indebtedness [Member]
Debt Instrument [Line Items]
Mortgages and notes payable	$ 1,875,239,000				$ 1,875,239,000			$ 1,826,145,000
London Interbank Offered Rate (LIBOR) [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility interest rate basis	LIBOR plus 110 basis points
Interest rate, basis spread (in hundredths)	1.10%
London Interbank Offered Rate (LIBOR) [Member] \| Variable Rate Term Loan (amended) due 2022 [Member]
Debt Instrument [Line Items]
Interest rate, basis spread (in hundredths)			1.10%
Variable interest rate basis			LIBOR plus 110 basis points
3.875% (4.038% effective rate) Notes due 2027 [Member]
Debt Instrument [Line Items]
Principal debt amount			$ 300,000,000
Interest rate (in hundredths)			3.875%
Floating to Fixed Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Amount of borrowings, subject to swaps		$ 50,000,000