Senior Unsecured Notes and Secured Debt (Details 2) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Secured debt principal activity
Secured debt issued	$ 10,690,000	$ 71,340,000
Secured debt extinguished	219,980,000	73,557,000
Excluding Fair Value Adjustments [Member]
Secured debt principal activity
Secured debt principal balance	2,812,226,000	2,839,025,000	3,010,711,000	2,311,586,000
Secured debt issued	10,690,000	71,340,000
Secured debt assumed	12,005,000	536,856,000
Secured debt extinguished	(188,722,000)	(49,156,000)
Secured debt principal payments	(31,258,000)	(24,709,000)
Secured debt foreign currency	$ (1,200,000)	$ (6,892,000)
Secured debt principal balance average rate	0.0504	0.0508	0.051	0.0514
Secured debt principal issued average rate	0.0354	0.0496
Secured debt principal assumed average rate	0.0415	0.0422
Secured debt principal extinguished average rate	0.0573	0.042
Secured debt principal payment average rate	0.0498	0.0539
Secured debt principal foreign currency average rate	0.0394	0.0387