Debt (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
Aug. 31, 2016 | Jul. 28, 2016 | May 28, 2015 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 |
Debt Instrument [Line Items] | | | | | | | |
Long-term Line of Credit | | | | | $ 47,000,000 | | $ 18,000,000 |
Long-term Debt, Total | | | | | 437,808,000 | | |
Secured Debt | | | | | 69,594,000 | | 100,391,000 |
Unsecured Debt | | | | | 159,211,000 | | 99,390,000 |
Repayments Of Secured Debt | | | | | 31,059,000 | $ 4,467,000 | |
Unamortized Debt Issuance Expense | | | | | 2,800,000 | | 2,700,000 |
Private Placement [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Unsecured Debt | | | $ 100,000,000 | | | | |
Debt [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Long-term Debt, Total | | | | | 437,800,000 | | |
Secured Debt | | | | | 70,600,000 | | |
Unsecured Debt | | | | | 160,200,000 | | |
Revolving Credit and Term Loan Facility [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Face Amount | | | | | $ 250,000,000 | | |
Senior Unsecured Note 2028 [Member] | Private Placement [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Unsecured Debt | | $ 60,000,000 | | | | | |
2019 Term Loan [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Unsecured Debt | $ 20,200,000 | | | | | | |
Mortgage Note Payable [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Long-term Debt, Weighted Average Interest Rate | | | | | 4.83% | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | 6.56% | | | |
Real Estate Investments, Net | | | | | $ 90,500,000 | | |
Secured Debt | | | | | $ 70,600,000 | | |
Repayments Of Secured Debt | | | | $ 8,600,000 | | | |
2021 Term Loan [Member] | Revolving Credit and Term Loan Facility [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | 3.74% | | |
Unsecured Debt | | | | | $ 65,000,000 | | 65,000,000 |
2020 Term Loan [Member] | Revolving Credit and Term Loan Facility [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Unsecured Debt | | | | | | | 35,000,000 |
Unsecured Debt [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Long-term Debt, Weighted Average Interest Rate | | | 4.21% | | | | |
Debt Instrument, Maturity Date | | | May 31, 2025 | | | | |
Unsecured Debt | | | | | 159,211,000 | | 99,390,000 |
Unamortized Debt Issuance Expense | | | | | 1,012,000 | | 610,000 |
Unsecured Debt [Member] | Weighted Average [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Term | | | 11 years | | | | |
Unsecured Debt [Member] | Senior Unsecured Note 2028 [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Maturity Date | | Jul. 28, 2028 | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | 4.42% | | | | | |
Unsecured Debt [Member] | 2019 Term Loan [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Face Amount | $ 20,300,000 | | | | | | |
Debt Instrument, Maturity Date | May 31, 2019 | | | | | | |
Unsecured Debt One [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Face Amount | | | $ 50,000,000 | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | 4.16% | | | | |
Unsecured Debt Two [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Face Amount | | | $ 50,000,000 | | | | |
Debt Instrument, Maturity Date | | | May 30, 2027 | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | 4.26% | | | | |
Mortgage Notes Payable [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Maturity Date | May 31, 2017 | | | | | | |
Debt Instrument, Description of Variable Rate Basis | LIBOR plus 170 basis points | | | | | | |
Secured Debt | | | | | 70,586,000 | | 101,584,000 |
Repayments Of Secured Debt | $ 20,300,000 | | | | | | |
Unamortized Debt Issuance Expense | | | | | 992,000 | | 1,193,000 |
Revolving Credit Facility [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | 150,000,000 | | |
Long-term Line of Credit | | | | | 150,000,000 | | |
Revolving Credit Facility [Member] | Revolving Credit and Term Loan Facility [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Long-term Line of Credit | | | | | $ 47,000,000 | | |
Long-term Debt, Weighted Average Interest Rate | | | | | 1.87% | | |
Debt Instrument, Face Amount | | | | | $ 103,000,000 | | |
Revolving Credit Facility [Member] | 2019 Term Loan [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Maturity Date | May 31, 2019 | | | | | | |
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 | $ 20,300,000 | | | | | | |
Revolving Credit Facility [Member] | 2021 Term Loan [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Maturity Date | | | | | Jul. 21, 2021 | | |
Debt Instrument, Description of Variable Rate Basis | | | | | interest rate swaps to fix LIBOR at 2.09% until maturity | | |
Revolving Credit Facility [Member] | 2020 Term Loan [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | 3.85% | | |
Debt Instrument, Description of Variable Rate Basis | LIBOR plus 165 to 225 basis points, depending on the Companys leverage, and the Company entered into interest rate swaps to fix LIBOR at 2.20% until maturity | | | | interest rate swap to fix LIBOR at 1.40% | | |
Unsecured Debt | | | | | $ 35,000,000 | | |
Revolving Credit Facility [Member] | 2023 Term Loan [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | $ 40,000,000 | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | 3.05% | | |
Debt Instrument, Description of Variable Rate Basis | | | | | LIBOR plus 165 to 225 basis points, depending on the Company’s leverage. The Company entered into interest rate swap to fix LIBOR at 1.40% until maturity. | | |
Unsecured Debt | | | | | $ 40,000,000 | | |
Senior Unsecured Notes [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Unsecured Debt | | | | | 160,000,000 | | |
April 4 2018 [Member] | Mortgage Notes Payable [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Secured Debt | | | | | $ 25,000,000 | | 25,000,000 |
April 4 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% | | |
January 1 2023 [Member] | Mortgage Notes Payable [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% | | |
January 2020 [Member] | Mortgage Notes Payable [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Secured Debt | | | | | $ 5,483,000 | | 6,553,000 |
January 2020 [Member] | Mortgages [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Periodic Payment, Principal | | | | | $ 153,838 | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | 6.90% | | |
July 2026 [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Secured Debt | | | | | $ 8,059,000 | | $ 8,493,000 |
July 2026 [Member] | Mortgages [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Periodic Payment, Principal | | | | | $ 91,675 | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | 6.27% | | |
March 11 2016 [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | 6.56% |
March 11 2016 [Member] | Mortgage Notes Payable [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Secured Debt | | | | | $ 0 | | $ 8,580,000 |
February 2020 [Member] | Mortgage Notes Payable [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Secured Debt | | | | | 3,070,000 | | 3,129,000 |
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% | | |
September 2023 [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Secured Debt | | | | | $ 5,334,000 | | 5,448,000 |
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% | | |
August 19 2016 [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | 56,380 |
August 19 2016 [Member] | Mortgage Notes Payable [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Secured Debt | | | | | $ 0 | | 20,741,000 |
August 19 2016 [Member] | Mortgages [Member] | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid | | | | | | | $ 20,283,000 |
Debt Instrument, Description of Variable Rate Basis | | | | | | | interest at 170 basis points over LIBOR, swapped to a fixed rate of 3.62% |