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Secured and Unsecured Debt (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Summary of unsecured debt    
Unsecured Debt, Total $ 2,213,964 $ 2,221,576
Unamortized discount 5,700 6,700
4.63% Medium-Term Notes due January 2022 [Member]    
Summary of unsecured debt    
Senior Unsecured Notes 397,656 397,477
Unamortized discount 2,344 2,523
1.67% Term Notes due December 2016 [Member]    
Summary of unsecured debt    
Senior Unsecured Notes 35,000 35,000
2.68% Term Notes due December 2016 [Member]    
Summary of unsecured debt    
Senior Unsecured Notes 100,000 100,000
5.25% Medium-Term Notes due January 2015 [Member]    
Summary of unsecured debt    
Senior Unsecured Notes 0 325,169
Unamortized discount 0 6
5.25% Medium-Term Notes due January 2016 [Member]    
Summary of unsecured debt    
Senior Unsecured Notes 83,260 83,260
2.90% Term Notes due January 2016 [Member]    
Summary of unsecured debt    
Senior Unsecured Notes 215,000 215,000
8.50% Debentures due September 2024 [Member]    
Summary of unsecured debt    
Senior Unsecured Notes 15,644 15,644
4.25% Medium-Term Notes due June 2018 [Member]    
Summary of unsecured debt    
Senior Unsecured Notes 298,749 298,535
Unamortized discount 1,251 1,465
Other [Member]    
Summary of unsecured debt    
Senior Unsecured Notes $ 26 $ 27