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Fair Value Disclosure (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
(Gain) loss on equity securities $ (1,545) $ 316  
Long-term debt fair value   10,400  
Long-term Debt 24,300 10,600  
Revolving Credit Agreements      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term debt fair value 24,300    
Level 1 | Fair Value, Measurements, Recurring | Bellaire      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
(Gain) loss on equity securities $ (1,500) $ 300  
Accounting Standards Update 2016-01      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cumulative effect of new accounting principles on retained earnings     $ 0
Accounting Standards Update 2016-01 | Retained Earnings      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cumulative effect of new accounting principles on retained earnings     $ 2,727