Senior Unsecured Notes and Secured Debt (Details 1) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Unsecured note issuances
Senior unsecured debt issued	$ 0	$ 497,862,000
Senior unsecured debt redeemed	(1,000)	(3,000)
Excluding Fair Value Adjustments [Member]
Unsecured note issuances
Senior unsecured debt balance	7,450,107,000	6,394,400,000	7,421,707,000	5,894,403,000
Senior unsecured debt issued	0	500,000,000
Senior unsecured debt redeemed	(1,000)	(3,000)
Senior unsecured debt foreign currency	$ 28,401,000	$ 0
Senior unsecured debt balance average rate	0.04402	0.04431	0.044	0.04675
Senior unsecured debt issued average rate	0	0.01552
Senior unsecured debt redeemed average rate	0.03	0.03
Senior unsecured debt foreign currency average rate	0.04865	0