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Debt Obligations - Future Maturities (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Scheduled Principal Payments          
2020   $ 40,160,000 $ 40,160,000    
2021   47,160,000 47,160,000    
2022   142,060,000 142,060,000    
2023   49,160,000 49,160,000    
2024   49,160,000 49,160,000    
Thereafter   366,500,000 366,500,000    
Total   694,200,000 694,200,000    
Other information          
Amount borrowed     207,900,000 $ 116,200,000 $ 213,000,000
Outstanding Balance   693,388,000 693,388,000 645,029,000  
Available for borrowing   527,600,000 527,600,000 581,833,000  
Payments on debt     159,667,000 138,866,000 154,767,000
Bank Borrowings          
Scheduled Principal Payments          
2022   93,900,000 93,900,000    
Total   93,900,000 93,900,000    
Other information          
Amount borrowed     107,900,000 116,200,000 113,000,000
Outstanding Balance   93,900,000 93,900,000 112,000,000  
Available for borrowing   506,100,000 506,100,000 488,000,000  
Payments on debt     126,000,000 100,700,000 123,600,000
Senior Unsecured Notes          
Scheduled Principal Payments          
2020   40,160,000 40,160,000    
2021   47,160,000 47,160,000    
2022   48,160,000 48,160,000    
2023   49,160,000 49,160,000    
2024   49,160,000 49,160,000    
Thereafter   366,500,000 366,500,000    
Total   600,300,000 600,300,000    
Other information          
Amount borrowed   100,000,000 100,000,000   100,000,000
Outstanding Balance   599,488,000 599,488,000 533,029,000  
Available for borrowing   $ 21,500,000 21,500,000 93,833,000  
Payments on debt     $ 33,667,000 $ 38,166,000 $ 31,167,000
Subsequent Event | Bank Borrowings          
Other information          
Amount borrowed $ 18,000,000        
Outstanding Balance 111,900,000        
Available for borrowing $ 488,100,000