Mortgage Note Payable (Schedule of Mortgage Notes Payable) (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended						6 Months Ended			12 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Mortgages [Member] property		Jun. 30, 2014 Mortgages [Member] property		Dec. 31, 2013 Mortgages [Member] property		Jun. 30, 2014 Mortgages [Member]		Jun. 30, 2014 Mortgages [Member] Interest Rate Swap [Member]	Jun. 30, 2014 Weighted Average [Member] Mortgages [Member]		Dec. 31, 2013 Weighted Average [Member] Mortgages [Member]		Jun. 30, 2014 Weighted Average [Member] Mortgages [Member]		Jun. 30, 2014 Minimum [Member] Mortgages [Member]	Dec. 31, 2013 Minimum [Member] Mortgages [Member]	Jun. 30, 2014 Maximum [Member] Mortgages [Member]	Dec. 31, 2013 Maximum [Member] Mortgages [Member]	Jun. 30, 2014 CapLease [Member] Mortgages [Member]
Debt Instrument [Line Items]
Encumbered Properties						757		757		177
Outstanding Loan Amount	$ 4,227,494,000		$ 4,227,494,000		$ 1,301,114,000	$ 4,125,621,000		$ 4,125,621,000		$ 1,258,661,000
Weighted Average Effective Interest Rate						4.90%	[1]	4.90%	[1]	3.42%	[1]	4.86%	[1]
Weighted Average Maturity															6 years	[2]	3 years 4 months 28 days	[2]	2 years 6 months	[2]
Effective interest rate																					2.40%	1.83%	7.20%	6.28%
Debt instrument, unamortized discount (premium), net						101,900,000		101,900,000																	137,400,000
Extinguishment of debt, amount						132,800,000		854,500,000
Payments for prepayments fees						3,700,000		33,500,000
Gain (loss) on derivative instruments, net	21,926,000	(40,000)	1,729,000	(45,000)										9,900,000
Write off of deferred debt issuance cost						$ (1,600,000)		$ (23,600,000)

[1] Mortgage notes payable primarily have fixed rates or are fixed by way of interest rate swap arrangements. Effective interest rates range from 2.40% to 7.20% at June 30, 2014 and 1.83% to 6.28% at December 31, 2013.

[2] Weighted average remaining years until maturity as of June 30, 2014 and December 31, 2013, respectively.