Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

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Stockholders' Equity - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Feb. 04, 2021
Feb. 01, 2021
Oct. 30, 2018
Mar. 31, 2021
Dec. 31, 2020
Nov. 09, 2018
Class of Stock [Line Items]              
Common shares, issued (in shares) 13,651,521       13,651,521 13,651,521  
Common shares, outstanding (in shares) 13,651,521       13,651,521 13,651,521  
Aggregate offering price             $ 600,000,000.0
Dividend Reinvestment Plan              
Class of Stock [Line Items]              
Reinvestment of dividends paid to common stockholders (in shares) 22,003     1,000,000      
Remaining availability (in shares) 977,997       977,997    
7.375% Series A Cumulative Redeemable Preferred Stock              
Class of Stock [Line Items]              
Preferred stock interest rate         7.375% 7.375%  
Series C Preferred Stock              
Class of Stock [Line Items]              
Preferred stock interest rate     9.00%        
Series C Preferred Stock | Class A-1 Units              
Class of Stock [Line Items]              
Equity instrument, shares issuable upon conversion (in shares)     1,613,202        
Depositary Shares | Series C Preferred Stock              
Class of Stock [Line Items]              
Equity instrument, shares issuable upon conversion (in shares)     1,716,172        
Series B Preferred Stock              
Class of Stock [Line Items]              
Preferred stock interest rate     4.00%   4.00%    
Series B Preferred Stock | Class A-2 Units              
Class of Stock [Line Items]              
Equity instrument, shares issuable upon conversion (in shares)     2,436,000        
Common Class B | Series B Preferred Stock              
Class of Stock [Line Items]              
Equity instrument, shares issuable upon conversion (in shares)     8,675,214        
Common Class B | Class A-3 Units              
Class of Stock [Line Items]              
Equity instrument, shares issuable upon conversion (in shares)     2,450,142        
Crimson Midstream Holdings, LLC              
Class of Stock [Line Items]              
New common and preferred equity issued in consideration for the acquisition     $ 115,300,000        
Depositary Shares              
Class of Stock [Line Items]              
Depository shares outstanding (in shares) 5,010,814       5,010,814    
Depositary Shares | 7.375% Series A Cumulative Redeemable Preferred Stock              
Class of Stock [Line Items]              
Percent equivalent of preferred shares   1.00%          
Preferred Stock              
Class of Stock [Line Items]              
Depository shares outstanding (in shares) 50,108       50,108    
Preferred Stock | 7.375% Series A Cumulative Redeemable Preferred Stock              
Class of Stock [Line Items]              
Preferred stock interest rate     7.375%   7.375%