Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Narrative (Details)

v3.20.2
Fair Value of Financial Instruments - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
financial_instrument
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
financial_instrument
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Sale of shares equity securities investments (in shares) | shares 705,926   705,926    
Realized gain on sale of equity securities $ 31,421   $ 31,421 $ 474,000  
Unrealized gains on equity securities 1,100,000   208,000 (101,000)  
Fair value of equity securities $ 1,800,000   $ 1,800,000   $ 4,300,000
Derivative asset, number of instruments held | financial_instrument 1   1    
Net realizable value $ 95,331,000   $ 95,331,000   98,186,000
Asset impairments 6,079,000 $ 0 6,079,000 $ 0  
$20 million Term loan, due January 1, 2024 | Interest Rate Swap | Level 2 Inputs          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative liability 100,000   100,000    
Derivative asset         $ 6,088
Palmer of Texas          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Net realizable value 2,100,000   2,100,000    
Fair value 1,700,000   1,700,000    
Asset impairments $ 6,100,000   $ 6,000,000.0