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Bank and Other Notes Payable (Details) - USD ($)		9 Months Ended	12 Months Ended
	Mar. 29, 2013	Sep. 30, 2018	Dec. 31, 2017
Mortgage loans payable on real estate
Unamortized deferred finance costs		$ 14,232,000	$ 17,838,000
Availability for additional borrowing		709,720,000	504,412,000
Swap | Level 2 measurement
Mortgage loans payable on real estate
Outstanding borrowings under the line of credit		400,000,000
Line of Credit
Mortgage loans payable on real estate
Outstanding borrowings under the line of credit		790,000,000	935,000,000
Unamortized deferred finance costs		$ 5,781,000	$ 7,548,000
Line of credit, average interest rate		4.08%	3.13%
Line of Credit | Level 2 measurement
Mortgage loans payable on real estate
Fair value of outstanding line of credit		$ 791,233,000	$ 919,158,000
Prasada Note
Mortgage loans payable on real estate
Amount of additional borrowing	$ 13,330,000
Interest rate on debt	5.25%
Debt, carrying value		3,903,000	4,732,000
Debt, fair value		$ 3,900,000	$ 4,717,000
LIBOR | Line of Credit
Mortgage loans payable on real estate
Interest rate spread over basis		1.45%
Revolving line of credit
Mortgage loans payable on real estate
Revolving line of credit		$ 1,500,000,000
Extension option (years)		1 year
Maximum contingent borrowing capacity		$ 2,000,000,000
Revolving line of credit | Swap
Mortgage loans payable on real estate
Effective interest rate		4.30%
Revolving line of credit | LIBOR | Low end of range
Mortgage loans payable on real estate
Interest rate spread over basis		1.30%
Revolving line of credit | LIBOR | High end of range
Mortgage loans payable on real estate
Interest rate spread over basis		1.90%

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- Definition

The term of the extension option on the credit facility.

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Line of Credit Facility, Maximum Contingent Borrowing Capacity

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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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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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Fixed interest rate that will be received or paid upon exercise of the interest rate swaption contract.

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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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Fair value of the amount outstanding under the credit facility.

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The effective interest rate during the reporting period.

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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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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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