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Debt Obligations - Bank Borrowings Terms (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Bank Borrowings  
Debt Obligations  
Maximum available under facility $ 600,000,000
Additional extension period option 1 year
Unused commitment fee (as a percent) 0.35%
Financial covenants  
Maximum ratio of total indebtedness to total asset value 0.5
Maximum ratio of secured debt to total asset value 0.35
Maximum ratio of unsecured debt to the value of the unencumbered asset pool 0.6
Minimum ratio of EBITDA to fixed charges 1.50
Bank Borrowings | LIBOR  
Debt Obligations  
Basis spread over base rate (as a percent) 1.50%
Private Shelf Agreement Prudential | Senior Unsecured Notes  
Debt Obligations  
Maximum available under facility $ 337,500,000