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Debt - Credit Facilities (Details) - USD ($)
Dec. 05, 2018
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Credit Facilities [Line Items]        
Line of credit, borrowings outstanding   $ 166,381,000   $ 0
Fifth Amended and Restated Credit Agreement | Line of Credit        
Credit Facilities [Line Items]        
Percentage of loan availability from pledged assets that cannot exceed availability from mortgaged assets 10.00%      
Line of credit, borrowings outstanding   166,400,000 $ 166,400,000  
Letters of credit issued   48,200,000    
Fifth Amended and Restated Credit Agreement | Line of Credit | Applicable Margin, Less Than Or Equal To 35% Utilization        
Credit Facilities [Line Items]        
Percentage of utilization 35.00%      
Fifth Amended and Restated Credit Agreement | Line of Credit | Applicable Margin, Greater Than 50% Utilization        
Credit Facilities [Line Items]        
Percentage of utilization 50.00%      
Fifth Amended and Restated Credit Agreement | Line of Credit | Unused Commitment Fee, Outstanding Debt Percentage Greater Than Or Equal To 50%        
Credit Facilities [Line Items]        
Quarterly commitment fee 0.25%      
Outstanding debt percentage 50.00%      
Fifth Amended and Restated Credit Agreement | Line of Credit | Unused Commitment Fee, Outstanding Debt Percentage Less Than 50%        
Credit Facilities [Line Items]        
Quarterly commitment fee 0.35%      
Outstanding debt percentage 50.00%      
Fifth Amended and Restated Credit Agreement | Line of Credit | Minimum | Applicable Margin, Greater Than 35% But Less Than Or Equal To 50% Utilization        
Credit Facilities [Line Items]        
Percentage of utilization 35.00%      
Fifth Amended and Restated Credit Agreement | Line of Credit | Maximum | Applicable Margin, Greater Than 35% But Less Than Or Equal To 50% Utilization        
Credit Facilities [Line Items]        
Percentage of utilization 50.00%      
Revolving Credit Facility | Fifth Amended and Restated Credit Agreement | Line of Credit        
Credit Facilities [Line Items]        
Credit facility, maximum borrowing capacity $ 250,000,000      
Line of credit facility, remaining borrowing capacity   37,900,000    
Letter of Credit Sublimit | Fifth Amended and Restated Credit Agreement | Line of Credit        
Credit Facilities [Line Items]        
Credit facility, maximum borrowing capacity 60,000,000      
Letters of credit issued   45,500,000    
Swingline Line of Credit | Fifth Amended and Restated Credit Agreement | Line of Credit        
Credit Facilities [Line Items]        
Credit facility, maximum borrowing capacity 50,000,000      
Option to Increase Maximum Borrowing Capacity | Fifth Amended and Restated Credit Agreement | Line of Credit        
Credit Facilities [Line Items]        
Credit facility, maximum borrowing capacity $ 100,000,000      
Letter of Credit | Fifth Amended and Restated Credit Agreement | Line of Credit        
Credit Facilities [Line Items]        
Credit facility, maximum borrowing capacity   $ 50,000,000.0    
LIBOR | Fifth Amended and Restated Credit Agreement | Line of Credit | Applicable Margin, Less Than Or Equal To 35% Utilization        
Credit Facilities [Line Items]        
Basis spread on variable rate basis 2.25%      
LIBOR | Fifth Amended and Restated Credit Agreement | Line of Credit | Applicable Margin, Greater Than 35% But Less Than Or Equal To 50% Utilization        
Credit Facilities [Line Items]        
Basis spread on variable rate basis 2.75%      
LIBOR | Fifth Amended and Restated Credit Agreement | Line of Credit | Applicable Margin, Greater Than 50% Utilization        
Credit Facilities [Line Items]        
Basis spread on variable rate basis 3.25%