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Summary of Significant Accounting Policies - Taxes (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Business Acquisition [Line Items]          
Net income $ 33,383,000 $ 19,316,000 $ 58,731,000 $ 84,354,000  
State and local income, excise and franchise taxes 400,000 500,000 800,000 900,000  
State and local income, excise and franchise taxes 400,000 500,000 800,000 900,000  
Liabilities for uncertain tax positions 0   0   $ 0
Real Estate Investment Trust          
Business Acquisition [Line Items]          
Net income $ (4,000) $ 0 $ (4,000) $ 0