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Debt - Credit Facilities (Details) - Line of Credit - USD ($)
Dec. 05, 2018
Mar. 31, 2019
Fifth Amended and Restated Credit Agreement    
Credit Facilities [Line Items]    
Percentage of loan availability from pledged assets that cannot exceed availability from mortgaged assets 10.00%  
Letters of credit issued   $ 49,100,000
Fifth Amended and Restated Credit Agreement | Applicable Margin, Less Than Or Equal To 35% Utilization    
Credit Facilities [Line Items]    
Percentage of utilization 35.00%  
Fifth Amended and Restated Credit Agreement | Applicable Margin, Greater Than 50% Utilization    
Credit Facilities [Line Items]    
Percentage of utilization 50.00%  
Fifth Amended and Restated Credit Agreement | 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 | 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 | 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 | Maximum | Applicable Margin, Greater Than 35% But Less Than Or Equal To 50% Utilization    
Credit Facilities [Line Items]    
Percentage of utilization 50.00%  
Fifth Amended and Restated Credit Agreement | LIBOR | Applicable Margin, Less Than Or Equal To 35% Utilization    
Credit Facilities [Line Items]    
Basis spread on variable rate basis 2.25%  
Fifth Amended and Restated Credit Agreement | LIBOR | 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%  
Fifth Amended and Restated Credit Agreement | LIBOR | Applicable Margin, Greater Than 50% Utilization    
Credit Facilities [Line Items]    
Basis spread on variable rate basis 3.25%  
Fifth Amended and Restated Credit Agreement | LIBOR | Minimum    
Credit Facilities [Line Items]    
Basis spread on variable rate basis 2.25%  
Fifth Amended and Restated Credit Agreement | LIBOR | Maximum    
Credit Facilities [Line Items]    
Basis spread on variable rate basis 3.25%  
Fourth Amended and Restated Credit Agreement    
Credit Facilities [Line Items]    
Line of credit   0
Fourth Amended and Restated Credit Agreement | LIBOR | Minimum    
Credit Facilities [Line Items]    
Basis spread on variable rate basis 2.50%  
Fourth Amended and Restated Credit Agreement | LIBOR | Maximum    
Credit Facilities [Line Items]    
Basis spread on variable rate basis 3.50%  
Revolving Credit Facility | Fifth Amended and Restated Credit Agreement    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity $ 250,000,000  
Line of credit facility, remaining borrowing capacity   190,000,000
Letter of credit sublimit | Fifth Amended and Restated Credit Agreement    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity 60,000,000  
Letters of credit issued   41,200,000
Swingline Line of Credit | Fifth Amended and Restated Credit Agreement    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity 50,000,000  
Option to increase maximum borrowing capacity | Fifth Amended and Restated Credit Agreement    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity $ 100,000,000  
Letter of Credit | Fifth Amended and Restated Credit Agreement    
Credit Facilities [Line Items]    
Credit facility, maximum borrowing capacity   $ 49,200,000