XML 112 R99.htm IDEA: XBRL DOCUMENT v3.20.4
Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Jan. 01, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]        
Income Tax Holiday, Description As a limited partnership, we are not subject to federal and state income taxes. However, our corporate subsidiaries are subject to income taxes. The Partnership is subject to the statutory requirement that non-qualifying income, as defined by the Internal Revenue Code, cannot exceed 10% of total gross income for the calendar year. If non-qualifying income exceeds this statutory limit, we would be taxed as a corporation. The Partnership’s non-qualifying income did not exceed the statutory limit in any period presented.      
Federal corporate income tax rate 21.00%      
Net tax benefit due to reduction of net deferred tax liability   $ 13,180,000    
Tax benefit resulted from valuation allowance release   3,700,000    
Unrecognized tax benefits $ 0 $ 0   $ 0
Earliest Tax Year [Member] | Federal Tax Authority [Member]        
Operating Loss Carryforwards [Line Items]        
Income tax year under examination 2016      
Earliest Tax Year [Member] | State and Local Jurisdiction [Member]        
Operating Loss Carryforwards [Line Items]        
Income tax year under examination 2016      
Latest Tax Year [Member] | Federal Tax Authority [Member]        
Operating Loss Carryforwards [Line Items]        
Income tax year under examination 2019      
Latest Tax Year [Member] | State and Local Jurisdiction [Member]        
Operating Loss Carryforwards [Line Items]        
Income tax year under examination 2019      
First Asset Exchange [Member]        
Operating Loss Carryforwards [Line Items]        
Net deferred tax liabilities with respect to the divested sites $ 4,800,000      
Income taxes payable with respect to the divested sites 5,100,000      
Net deferred tax assets with respect to the acquired sites 2,300,000      
Second Asset Exchange [Member]        
Operating Loss Carryforwards [Line Items]        
Income taxes payable with respect to the divested sites 2,100,000      
Net deferred tax assets with respect to the acquired sites 2,400,000      
Net deferred tax assets with respect to the divested sites $ 200,000      
ASU 2016-02 [Member]        
Operating Loss Carryforwards [Line Items]        
Deferred tax assets, sale leaseback     $ 5,200,000  
Minimum [Member]        
Operating Loss Carryforwards [Line Items]        
Percentage of qualifying income to gross income 90.00%      
Maximum [Member]        
Operating Loss Carryforwards [Line Items]        
Limited Partnership Percentage Of Non Qualifying Income To Gross Income 10.00%