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Debt (Details Textual) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Mar. 29, 2018
Jul. 31, 2016
May 31, 2015
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Aug. 31, 2017
Dec. 31, 2016
Aug. 31, 2016
Debt Instrument [Line Items]                  
Long-term Line of Credit       $ 166,000,000   $ 14,000,000      
Long-term Debt, Total       647,752,000          
Secured Debt       62,136,000   88,270,000      
Unsecured Debt       157,901,000   $ 158,171,000      
Repayments Of Secured Debt       26,267,000 $ 1,187,000        
Private Placement [Member]                  
Debt Instrument [Line Items]                  
Unsecured Debt             $ 100,000,000    
Debt [Member]                  
Debt Instrument [Line Items]                  
Long-term Debt, Total       647,700,000          
Secured Debt       $ 62,800,000          
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       4.18%   3.74%      
Debt Instrument, Interest Rate, Stated Percentage           3.32%      
Real Estate Investments, Net       $ 109,500,000          
Secured Debt       62,800,000          
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     4.21%            
Debt Instrument, Maturity Date   Jul. 31, 2028              
Debt Instrument, Interest Rate, Stated Percentage   4.42%              
Unsecured Debt       157,901,000   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          
Debt Instrument, Description of Variable Rate Basis       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.          
Unsecured Debt One [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount     $ 50,000,000            
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%            
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity       $ 84,000,000       250,000,000  
Long-term Line of Credit       $ 166,000,000   $ 14,000,000      
Long-term Debt, Weighted Average Interest Rate       3.20%   2.60%      
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 an interest rate swap to fix LIBOR at 140 basis points until maturity.   Borrowings under the revolving credit facility bear interest at LIBOR plus 130 to 195 basis points, depending on the Company’s leverage ratio.          
Unsecured Debt   $ 40,000,000   $ 40,000,000          
Line of Credit facility, Maximum Limit of Borrowing Capacity               $ 500,000,000  
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       $ 18,900,000         $ 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       158,900,000          
Senior Unsecured Notes [Member]                  
Debt Instrument [Line Items]                  
Unsecured Debt       $ 260,000,000          
Proceeds from Issuance of Private Placement   $ 60,000,000 $ 100,000,000            
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] | Mortgages [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Periodic Payment, Principal       $ 153,838          
Debt Instrument, Interest Rate, Stated Percentage       6.90%          
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] | Mortgages [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage       3.60%          
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] | 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%