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Debt - Bank Line of Credit and Term Loan (Details)
£ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 23, 2019
USD ($)
renewal_option
Jul. 03, 2018
USD ($)
Jul. 03, 2018
GBP (£)
Nov. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
GBP (£)
May 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument                      
Loss on debt extinguishments         $ (1,135,000) $ 0 $ (1,135,000) $ 0      
Bank line of credit         530,004,000   530,004,000       $ 80,103,000
Repayment under bank line of credit             890,000,000 $ 923,164,000      
Term loan       $ 0 $ 248,821,000   $ 248,821,000       $ 0
2015 Term Loan                      
Debt Instrument                      
Repayment under bank line of credit | £     £ 169                
Repayments of debt       $ 224,000,000              
2018 term loan                      
Debt Instrument                      
Issuance and borrowings of debt, excluding bank line of credit   $ 224,000,000                  
Line of Credit and Term Loan                      
Debt Instrument                      
Debt instrument, covenant debt to assets (as a percent)         60.00%   60.00%   60.00%    
Debt instrument, covenant secured debt to assets (as a percent)         40.00%   40.00%   40.00%    
Debt instrument, covenant unsecured debt to unencumbered assets (as a percent)         60.00%   60.00%   60.00%    
Debt instrument, covenant minimum fixed charge coverage ratio         1.5   1.5   1.5    
Debt instrument, covenant net worth         $ 7,000,000,000.0   $ 7,000,000,000.0        
Bank Line of Credit | Revolving Credit Facility                      
Debt Instrument                      
Line of credit facility, maximum borrowing capacity $ 2,500,000,000                    
Number of extensions | renewal_option 2                    
Length of debt instrument extension period 6 months                    
Debt instrument, facility fee (as a percent)             0.15%        
Line of credit facility additional aggregate amount, maximum             $ 750,000,000        
Bank line of credit         530,000,000   530,000,000        
Debt denominated in foreign currency outstanding         $ 70,000,000   $ 70,000,000   £ 55    
Weighted-average interest rate (as a percent)         3.29%   3.29%   3.29%    
Bank Line of Credit | Revolving Credit Facility | LIBOR                      
Debt Instrument                      
Debt instrument, basis spread on variable rate (as a percent)             0.825%        
Bank Line of Credit | 2019 Term Loan                      
Debt Instrument                      
Weighted-average interest rate (as a percent)         3.38%   3.38%   3.38%    
Face amount                   $ 250,000,000  
Bank Line of Credit | 2019 Term Loan | LIBOR                      
Debt Instrument                      
Debt instrument, basis spread on variable rate (as a percent)             0.90%