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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards      
Income Tax Expense (Benefit) $ 3,380 $ 1,736 $ 1,900
Cash paid for income taxes 1,232 416 515
Income taxes payable 385 556  
Difference between partnership's tax basis and reported amounts 91,893 88,526  
State      
Operating Loss Carryforwards      
Income taxes payable 304 455  
MTI      
Operating Loss Carryforwards      
Income Tax Expense (Benefit) 3,080 1,268  
Net operating loss carryforwards 67,681    
Net operating loss carryforwards, subject to expiration 19,379    
Net operating loss carryforwards, not subject to expiration 48,302    
MTI | State      
Operating Loss Carryforwards      
Income taxes refundable 81 101  
MTI | Federal      
Operating Loss Carryforwards      
Income taxes refundable 70 0  
Texas      
Operating Loss Carryforwards      
State income taxes $ 300 $ 468 $ 458