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Debt - Unsecured Term Loan (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Line Of Credit Facility Covenant Actual Results        
Debt Instrument [Line Items]        
Maximum leverage ratio (as a percent) 0.251   0.251  
Unsecured Term Loan | Less than or equal to 35% | Maximum        
Debt Instrument [Line Items]        
Ratio of net indebtedness to EBITDA     0.35  
Unsecured Term Loan | Greater than 35% but less than or equal to 45% | Minimum        
Debt Instrument [Line Items]        
Ratio of net indebtedness to EBITDA     0.35  
Unsecured Term Loan | Greater than 35% but less than or equal to 45% | Maximum        
Debt Instrument [Line Items]        
Ratio of net indebtedness to EBITDA     0.45  
Unsecured Term Loan | Greater than 45% but less than or equal to 50% | Minimum        
Debt Instrument [Line Items]        
Ratio of net indebtedness to EBITDA     0.45  
Unsecured Term Loan | Greater than 45% but less than or equal to 50% | Maximum        
Debt Instrument [Line Items]        
Ratio of net indebtedness to EBITDA     0.5  
Unsecured Term Loan | Greater than 50% but less than or equal to 55% | Minimum        
Debt Instrument [Line Items]        
Ratio of net indebtedness to EBITDA     0.5  
Unsecured Term Loan | Greater than 50% but less than or equal to 55% | Maximum        
Debt Instrument [Line Items]        
Ratio of net indebtedness to EBITDA     0.55  
Unsecured Term Loan | Greater than 55% | Minimum        
Debt Instrument [Line Items]        
Ratio of net indebtedness to EBITDA     0.55  
Term loan | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate     1.45%  
Interest incurred on the facility $ 2.6 $ 1.5 $ 5.0 $ 2.1
Term loan | LIBOR | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate     1.45%  
Term loan | LIBOR | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate     2.00%  
Term loan | LIBOR | Less than or equal to 35%        
Debt Instrument [Line Items]        
Basis spread on variable rate     1.45%  
Term loan | LIBOR | Greater than 35% but less than or equal to 45%        
Debt Instrument [Line Items]        
Basis spread on variable rate     1.60%  
Term loan | LIBOR | Greater than 45% but less than or equal to 50%        
Debt Instrument [Line Items]        
Basis spread on variable rate     1.75%  
Term loan | LIBOR | Greater than 50% but less than or equal to 55%        
Debt Instrument [Line Items]        
Basis spread on variable rate     1.95%  
Term loan | LIBOR | Greater than 55%        
Debt Instrument [Line Items]        
Basis spread on variable rate     2.20%  
Term loan | Unsecured Term Loan Due May 2021        
Debt Instrument [Line Items]        
Debt instrument, term (in years)     5 years