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Debt Obligations (Shedule of Debt) (Details)
6 Months Ended
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 12, 2018
USD ($)
derivative_instrument
Nov. 01, 2016
USD ($)
derivative_instrument
Debt obligations under various arrangements with financial institutions        
Long-term debt $ 4,970,453,000      
Net unamortized debt issuance costs (33,780,000)      
Net unamortized discount (11,136,000)      
Total debt obligations 4,925,537,000 $ 4,885,863,000    
Collateral carrying value 16,200,000      
Term Loan | Unsecured $500 Million Term Loan | Interest Rate Swap        
Debt obligations under various arrangements with financial institutions        
Number of Instruments | derivative_instrument       3
Secured Debt        
Debt obligations under various arrangements with financial institutions        
Long-term debt 7,000,000 7,000,000    
Net unamortized discount 237,000 262,000    
Net unamortized debt issuance costs (41,000) (45,000)    
Long-term Debt $ 7,196,000 7,217,000    
Stated percentage 4.40%      
Unsecured Debt        
Debt obligations under various arrangements with financial institutions        
Long-term debt $ 3,868,453,000 3,468,453,000    
Net unamortized debt issuance costs (22,591,000) (20,877,000)    
Net unamortized discount (11,373,000) (11,562,000)    
Long-term Debt $ 3,834,489,000 3,436,014,000    
Weighted average fixed interest rate 3.83%      
Unsecured Debt | Minimum        
Debt obligations under various arrangements with financial institutions        
Stated percentage 3.25%      
Unsecured Debt | Maximum        
Debt obligations under various arrangements with financial institutions        
Stated percentage 7.97%      
Unsecured Debt | Term Loan        
Debt obligations under various arrangements with financial institutions        
Long-term debt $ 300,000,000 500,000,000    
Stated percentage 3.69%      
Unsecured Debt | Term Loan | Unsecured $350 Million Term Loan        
Debt obligations under various arrangements with financial institutions        
Long-term debt $ 350,000,000 350,000,000    
Stated percentage 3.69%      
Term loan face amount     $ 350,000,000.0  
Unsecured Debt | Term Loan | Unsecured $300 Million Term Loan        
Debt obligations under various arrangements with financial institutions        
Long-term debt $ 300,000,000 300,000,000    
Stated percentage 4.34%      
Term loan face amount     $ 300,000,000.0  
Effective percentage     2.61%  
Unsecured Debt | Term Loan | Unsecured $300 Million Term Loan | Interest Rate Swap        
Debt obligations under various arrangements with financial institutions        
Number of Instruments | derivative_instrument     4  
Unsecured Debt | Term Loan | Unsecured $300 Million Term Loan | Through July 28, 2019        
Debt obligations under various arrangements with financial institutions        
Stated spread rate 1.90%      
Unsecured Debt | Term Loan | Unsecured $300 Million Term Loan | Through July 26, 2024        
Debt obligations under various arrangements with financial institutions        
Stated spread rate 1.25%      
Unsecured Debt | Term Loan | Unsecured $500 Million Term Loan        
Debt obligations under various arrangements with financial institutions        
Stated spread rate 1.25%      
Term loan face amount     $ 500,000,000.0  
Effective percentage     1.11%  
Unsecured Debt | Term Loan | Unsecured $500 Million Term Loan | Interest Rate Swap        
Debt obligations under various arrangements with financial institutions        
Term loan face amount       $ 150,000,000.0
Unsecured Debt | Unsecured Credit Facility        
Debt obligations under various arrangements with financial institutions        
Long-term debt $ 145,000,000 306,000,000    
Stated percentage 3.50%      
Unsecured Debt | Unsecured Credit Facility and Term Loan        
Debt obligations under various arrangements with financial institutions        
Net unamortized debt issuance costs $ (11,148,000) (13,368,000)    
Long-term Debt $ 1,083,852,000 $ 1,442,632,000