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Debt - Unsecured Term Loan (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Line Of Credit Facility Covenant Actual Results    
Debt Instrument [Line Items]    
Maximum leverage ratio (as a percent) 0.282  
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  
Unsecured Term Loan Due May 2021 | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.45%  
Unsecured Term Loan Due April 2022 | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.45%  
Term loan | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.45%  
Interest incurred on the facility $ 2.3 $ 0.6
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