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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Carrying Value | Secured Debt    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt instrument $ 395,202 $ 267,093
Carrying Value | Unsecured Debt    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt instrument 2,285,698 2,283,513
Fair Value | Secured Debt    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt instrument 397,167 267,298
Fair Value | Unsecured Debt    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt instrument $ 2,295,699 $ 2,359,998