Quarterly report pursuant to Section 13 or 15(d)

Notes Payable and Revolving Credit Facility (Details)

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Notes Payable and Revolving Credit Facility (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 25, 2017
Dec. 02, 2016
Sep. 25, 2015
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2017
Mar. 06, 2018
Mar. 05, 2018
Debt Instrument [Line Items]                  
Amortization of Financing Costs       $ 32,000 $ 33,000        
Long-term Line of Credit       229,150,000     $ 164,900,000    
Increase (Decrease) in Security Deposits       $ 2,784,000 1,380,000        
Debt, Weighted Average Interest Rate       3.95%     3.72%    
Debt Instrument, Term       2 years 5 months 8 days     2 years 11 months 8 days    
Long-term Debt, Gross       $ 39,475,000     $ 39,475,000    
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Amortization of Financing Costs       398,000 126,000        
Line of Credit Facility, Maximum Borrowing Capacity               $ 340,000,000 $ 90,000,000
Line of Credit Facility, Interest Rate Description   (i) adjusted LIBOR plus 2.00% to 3.00% or (ii) a base rate plus 1.00% to 2.00%, in each case, depending upon the Company’s consolidated leverage ratio.              
Line of Credit Facility, Commitment Fee Description   (x) 0.20% if the average daily unused commitments are less than 50% of the commitments then in effect and (y) 0.30% if the average daily unused commitments are greater than or equal to 50% of the commitments then in effect and determined based on the average daily unused commitments during such previous quarter.              
Line of Credit Facility, Covenant Compliance   The Operating Partnership is subject to ongoing compliance with a number of customary affirmative and negative covenants, including limitations with respect to liens, indebtedness, distributions, mergers, consolidations, investments, restricted payments and asset sales. The Operating Partnership must also maintain (i) a maximum consolidated leverage ratio, commencing with the fiscal quarter ending December 31, 2016 and as of the end of each fiscal quarter thereafter, of less than (y) 0.65:1.00 for each fiscal quarter ending prior to October 1, 2019 and (z) thereafter, 0.60:1.00, (ii) a minimum fixed charge coverage ratio of 1.50:1.00, (iii) a minimum net worth of $119,781 plus 75% of all net proceeds raised through subsequent equity offerings and (iv) a ratio of total secured recourse debt to total asset value of not greater than 0.10:1.00.              
Other Operating Activities, Cash Flow Statement       68,750,000 101,200,000        
Increase (Decrease) in Security Deposits       1,766,000 454,000        
Repayments of Lines of Credit       4,500,000          
Long-term Debt, Gross       64,250,000          
Cantor Loan [Member]                  
Debt Instrument [Line Items]                  
Long-term Debt, Total       32,097,000   $ 32,097,000      
Debt Instrument, Interest Rate, Stated Percentage           5.22%      
Debt Instrument, Description           Prepayment can only occur within four months prior to the maturity date, except that after the earlier of (a) two years after the loan is placed in a securitized mortgage pool, or (b) May 6, 2020, the Cantor Loan can be fully and partially defeased upon payment of amounts due under the Cantor Loan and payment of a defeasance amount that is sufficient to purchase U.S. government securities equal to the scheduled payments of principal, interest, fees, and any other amounts due related to a full or partial defeasance under the Cantor Loan. The Company secured the payment of the Cantor Loan with the assets, including property, facilities, and rents, held by the GMR Loan Subsidiaries and has agreed to guarantee certain customary recourse obligations, including findings of fraud, gross negligence, or breach of environmental covenants by the GMR Loan Subsidiaries. The GMR Loan Subsidiaries will be required to maintain a monthly debt service coverage ratio of 1.35:1.00 for all of the collateral properties in the aggregate.      
Debt Instrument, Maturity Date           Apr. 06, 2026      
Interest Expense, Debt       419,000 $ 419,000        
West Mifflin Note Payable [Member]                  
Debt Instrument [Line Items]                  
Long-term Debt, Total     $ 7,378 7,378,000     $ 7,378,000    
Debt Instrument, Interest Rate, Stated Percentage     3.72%            
Debt Instrument, Description     The note requires a quarterly fixed charge coverage ratio of at least 1:1, a quarterly minimum debt yield of 0.09:1.00, and annualized Operator EBITDAR (as defined in the note) measured on a quarterly basis of not less than $6,000.            
Debt Instrument, Maturity Date Sep. 25, 2015   Sep. 25, 2020            
Interest Expense, Debt       $ 69,000