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Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 29, 2018
Aug. 31, 2016
Jul. 31, 2016
May 31, 2015
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Aug. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]                  
Long-term Line of Credit         $ 76,000,000   $ 14,000,000    
Long-term Debt, Total         558,579,000        
Secured Debt         62,724,000   88,270,000    
Unsecured Debt         158,037,000   $ 158,171,000    
Repayments Of Secured Debt         25,630,000 $ 590,000      
Private Placement [Member]                  
Debt Instrument [Line Items]                  
Unsecured Debt               $ 100,000,000  
Debt [Member]                  
Debt Instrument [Line Items]                  
Long-term Debt, Total         558,600,000        
Secured Debt         $ 63,500,000        
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         4.21%   3.74%    
Debt Instrument, Interest Rate, Stated Percentage             3.32%    
Real Estate Investments, Net         $ 110,500,000        
Secured Debt         63,500,000        
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, Interest Rate, Stated Percentage     4.42%            
Unsecured Debt         158,037,000   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 165 to 235 basis points, depending on the Company's leverage ratio        
Unsecured Debt One [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount       $ 50,000,000          
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, Interest Rate, Stated Percentage       4.26%          
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity         $ 174,000,000       250,000,000
Long-term Line of Credit         $ 76,000,000   $ 14,000,000    
Long-term Debt, Weighted Average Interest Rate         3.00%   2.60%    
Debt Instrument, Interest Rate, Stated Percentage         3.05%        
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, 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     $ 19,100,000        
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         159,100,000        
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] | Mortgage Note Payable [Member]                  
Debt Instrument [Line Items]                  
Repayment Of Debt Instrument, Balloon Payment $ 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%        
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] | Mortgage Note Payable [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage         3.32%