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Senior Unsecured Notes and Secured Debt (Details 1)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Unsecured note principal activity        
Senior unsecured debt issued $ 7,500 $ 693,560 $ 1,451,434  
Senior unsecured debt redeemed 5,000 865,863 558,830  
Unsecured Debt [Member]        
Unsecured note principal activity        
Senior unsecured debt balance 8,417,447 8,260,038 8,645,758 $ 7,817,154
Senior unsecured debt issued 7,500 705,000 1,475,540  
Senior unsecured debt assumed 0 0 24,621  
Senior unsecured debt extinguished (5,000) (850,000) (300,000)  
Senior unsecured debt redeemed 0 0 (240,249)  
Senior unsecured debt foreign currency $ 154,909 $ (240,720) $ (131,308)  
Senior unsecured debt balance average rate 0.04306 0.04245 0.04237 0.04385
Senior unsecured debt issued average rate 0.01973 0.04228 0.03901  
Senior unsecured debt assumed average rate 0 0 0.06  
Senior unsecured debt extinguished average rate 0.0183 0.04194 0.062  
Senior unsecured debt redeemed average rate 0 0 0.03303  
Senior unsecured debt foreign currency average rate 0.04288 0.04565 0.03966