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Debt - Credit Facilities (Details) - USD ($)
Dec. 05, 2018
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  
Letters of credit issued   47,500,000  
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   35,300,000  
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   48,100,000  
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%