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Debt Obligations - Future Maturities (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Scheduled Principal Payments        
2019   $ 33,667,000    
2020   40,160,000    
2021   47,160,000    
2022   160,160,000    
2023   49,160,000    
Thereafter   315,660,000    
Total   645,967,000    
Other information        
Amount borrowed   116,200,000 $ 213,000,000 $ 201,100,000
Outstanding Balance   645,029,000 667,502,000  
Available for borrowing   581,833,000 567,167,000  
Payments on debt   138,866,000 154,767,000 163,667,000
Bank Borrowings        
Scheduled Principal Payments        
2022   112,000,000    
Total   112,000,000    
Other information        
Amount borrowed   116,200,000 113,000,000 123,600,000
Outstanding Balance   112,000,000 96,500,000  
Available for borrowing   488,000,000 503,500,000  
Payments on debt   100,700,000 123,600,000 137,000,000
Senior Unsecured Notes        
Scheduled Principal Payments        
2019   33,667,000    
2020   40,160,000    
2021   47,160,000    
2022   48,160,000    
2023   49,160,000    
Thereafter   315,660,000    
Total   533,967,000    
Other information        
Amount borrowed     100,000,000 77,500,000
Outstanding Balance   533,029,000 571,002,000  
Available for borrowing   93,833,000 63,667,000  
Payments on debt   $ 38,166,000 $ 31,167,000 $ 26,667,000
Subsequent Event | Bank Borrowings        
Other information        
Amount borrowed $ 26,400,000      
Outstanding Balance 138,400,000      
Available for borrowing 461,600,000      
Subsequent Event | Senior Unsecured Notes        
Other information        
Outstanding Balance 528,862,000      
Available for borrowing 98,000,000      
Payments on debt $ 4,167,000