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Debt (Details Textual) - USD ($) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
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% |  |  |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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