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Debt Obligations (Shedule of Debt) (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 12, 2018
USD ($)
derivative_instrument
Debt obligations under various arrangements with financial institutions      
Long-term debt $ 4,916,453,000    
Net unamortized debt issuance costs (32,556,000)    
Net unamortized discount (10,832,000)    
Total debt obligations 4,873,065,000 $ 4,885,863,000  
Collateral carrying value 0    
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 250,000 262,000  
Net unamortized debt issuance costs (43,000) (45,000)  
Long-term Debt $ 7,207,000 7,217,000  
Stated percentage 4.40%    
Unsecured Debt      
Debt obligations under various arrangements with financial institutions      
Long-term debt $ 3,468,453,000 3,468,453,000  
Net unamortized debt issuance costs (19,902,000) (20,877,000)  
Net unamortized discount (11,082,000) (11,562,000)  
Long-term Debt $ 3,437,469,000 3,436,014,000  
Weighted average fixed interest rate 3.81%    
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 $ 500,000,000 500,000,000  
Stated percentage 3.74%    
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 3.74%    
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 4.39%    
Term loan face amount     $ 300,000,000
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 | Unsecured Credit Facility      
Debt obligations under various arrangements with financial institutions      
Long-term debt $ 291,000,000 306,000,000  
Stated percentage 3.59%    
Unsecured Debt | Unsecured Credit Facility and Term Loan      
Debt obligations under various arrangements with financial institutions      
Net unamortized debt issuance costs $ (12,611,000) (13,368,000)  
Long-term Debt $ 1,428,389,000 $ 1,442,632,000