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Debt - Credit Facilities (Details)
3 Months Ended
Dec. 05, 2018
USD ($)
Sep. 30, 2019
community
Aug. 06, 2019
USD ($)
Jun. 30, 2019
USD ($)
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%      
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%      
Fifth Amended and Restated Credit Agreement | Line of Credit | 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 | Line of Credit | 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 | Line of Credit | 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 | Line of Credit | LIBOR | Minimum        
Credit Facilities [Line Items]        
Basis spread on variable rate basis 2.25%      
Fifth Amended and Restated Credit Agreement | Line of Credit | LIBOR | Maximum        
Credit Facilities [Line Items]        
Basis spread on variable rate basis 3.25%      
Fourth Amended and Restated Credit Agreement | Line of Credit        
Credit Facilities [Line Items]        
Line of credit       0
Fourth Amended and Restated Credit Agreement | Line of Credit | LIBOR | Minimum        
Credit Facilities [Line Items]        
Basis spread on variable rate basis 2.50%      
Fourth Amended and Restated Credit Agreement | Line of Credit | LIBOR | Maximum        
Credit Facilities [Line Items]        
Basis spread on variable rate basis 3.50%      
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       163,500,000
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       41,200,000
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       $ 47,500,000
Subsequent Event        
Credit Facilities [Line Items]        
Number of communities added to borrowing base and agreement during period | community   3    
Subsequent Event | Revolving Credit Facility        
Credit Facilities [Line Items]        
Line of credit facility, remaining borrowing capacity     $ 180,800,000