The cash out flow towards balloon payment.

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

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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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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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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Amount of increase (decrease) of the credit facility.

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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, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

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Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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

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Debt (Details Textual) - USD ($)	1 Months Ended				9 Months Ended		12 Months Ended
Debt (Details Textual) - USD ($)	Jul. 31, 2018	Mar. 29, 2018	Jul. 31, 2016	May 31, 2015	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016	Aug. 31, 2016
Debt Instrument [Line Items]
Long-term Line of Credit					$ 14,000,000		$ 14,000,000
Debt Instrument, Face Amount				$ 50,000,000
Real Estate Investments, Net					$ 107,900,000
Debt Instrument, Description of Variable Rate Basis			Borrowings under the revolving credit facility bear interest at LIBOR plus 85 to 155 basis points, depending on the Company’s credit rating. Additionally, the Company is required to pay a facility fee at an annual rate of 0 to 55 basis points of the total amount of the revolving credit facility, depending on the Company’s credit rating.		Borrowings under the unsecured 2024 Term Loan Facilities bear interest at a variable LIBOR plus 150 to 245 basis points, depending on the Company's credit rating.
Long-term Debt					$ 619,913,000
Secured Debt					61,537,000		88,270,000
Unsecured Debt					157,760,000		$ 158,171,000
Repayments of Secured Debt					26,915,000	$ 1,794,000
Proceeds from Issuance of Private Placement			$ 60,000,000	$ 100,000,000
Private Placement [Member]
Debt Instrument [Line Items]
Unsecured Debt								$ 100,000,000
Debt [Member]
Debt Instrument [Line Items]
Long-term Debt					619,900,000
Secured Debt					$ 62,200,000
Revolving Credit and Term Loan Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									$ 350,000,000
Mortgage Note Payable [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time					4.16%		3.74%
Debt Instrument, Interest Rate, Stated Percentage							3.32%
Repayments of Secured Debt							$ 21,500,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									65,000,000
Long-term Debt, Weighted Average Interest Rate, at Point in Time				4.21%
Debt Instrument, Maturity Date			Jul. 31, 2028
Debt Instrument, Interest Rate, Stated Percentage			4.42%
Unsecured Debt					$ 157,760,000		158,171,000
Unsecured Debt [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Debt Instrument, Term				11 years
Unsecured Debt [Member] \| 2024 Term Loan Facility One [Member)
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					65,000,000				35,000,000
Debt Instrument, Face Amount					65,000,000
Unsecured Debt [Member] \| 2024 Term Loan Facility Two [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					35,000,000
Debt Instrument, Face Amount					$ 35,000,000
Unsecured Debt [Member] \| 2024 Term Loan Facilitilies [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date					Jan. 31, 2024
Unsecured Debt One [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date				May 31, 2025
Debt Instrument, Interest Rate, Stated Percentage				4.16%				4.19%
Unsecured Debt Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 50,000,000
Debt Instrument, Maturity Date				May 31, 2027
Debt Instrument, Interest Rate, Stated Percentage				4.26%
Unsecured Debt Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 125,000,000
Debt Instrument, Maturity Date					Sep. 30, 2030
Debt Instrument, Interest Rate, Stated Percentage					4.32%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250,000,000		$ 325,000,000		$ 311,000,000				500,000,000
Long-term Line of Credit					$ 14,000,000		$ 14,000,000
Long-term Debt, Weighted Average Interest Rate, at Point in Time					3.20%		2.60%
Debt Instrument, Interest Rate, Stated Percentage					3.05%
Debt Instrument, Description of Variable Rate Basis					The Company entered into an interest rate swap to fix LIBOR at 140 basis points until maturity.
Unsecured Debt			$ 40,000,000		$ 40,000,000
Line of Credit Facility, Increase (Decrease), Net	$ 75,000,000
Revolving Credit Facility [Member] \| Debt [Member]
Debt Instrument [Line Items]
Long-term Line of Credit					$ 14,000,000
Revolving Credit Facility [Member] \| 2019 Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					3.62%
Debt Instrument, Description of Variable Rate Basis					LIBOR plus 170 basis points. In order to fix LIBOR on the 2019 Term Loan at 1.92% until maturity
Unsecured Debt					$ 18,700,000					$ 20,300,000
Revolving Credit Facility [Member] \| 2024 Term Loan Facilitilies [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					3.78%
Unsecured Debt					$ 100,000,000
Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Unsecured Debt					158,700,000
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term Line of Credit					385,000,000
Senior Unsecured Notes [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									$ 325,000,000
March 29 2018 [Member]
Debt Instrument [Line Items]
Secured Debt					$ 0		$ 25,000,000
March 29 2018 [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis					interest only at LIBOR plus 160 basis points, swapped to a fixed rate of 2.49%
Repayment Of Debt Instrument, Balloon Payment		$ 25,000,000
January 2020 [Member]
Debt Instrument [Line Items]
Secured Debt					$ 2,345,000		3,573,000
January 2020 [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal					$ 153,838
Debt Instrument, Interest Rate, Stated Percentage					6.90%
February 2020 [Member]
Debt Instrument [Line Items]
Secured Debt					$ 2,896,000		2,963,000
February 2020 [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal					23,004
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid					$ 2,781,819
Debt Instrument, Interest Rate, Stated Percentage					6.24%
January 1 2023 [Member]
Debt Instrument [Line Items]
Secured Debt					$ 23,640,000		23,640,000
January 1 2023 [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					3.60%
September 2023 [Member]
Debt Instrument [Line Items]
Secured Debt					$ 5,003,000		5,131,000
September 2023 [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal					35,673
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid					$ 4,034,627
Debt Instrument, Interest Rate, Stated Percentage					5.01%
July 2026 [Member]
Debt Instrument [Line Items]
Secured Debt					$ 6,795,000		$ 7,288,000
July 2026 [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment, Principal					$ 91,675
Debt Instrument, Interest Rate, Stated Percentage					6.27%
October 29 [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					3.32%