Derivative and Other Fair Value Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 678	$ 18,710
Other Assets, Fair Value Disclosure	98,350	83,845
Assets, Fair Value Disclosure	99,028	102,555
Derivative Liability	2,485
Derivative liability, fair value	2,927
Other Liabilities, Fair Value Disclosure	98,350	83,845
Liabilities, Fair Value Disclosure	103,762	83,845
Redeemable Noncontrolling Interest Operating Partnership Fair Value Disclosure	430,149	363,144
Fair Value, Inputs, Level 1 [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	0	0
Other Assets, Fair Value Disclosure	98,350	83,845
Assets, Fair Value Disclosure	98,350	83,845
Derivative Liability	0
Derivative liability, fair value	0
Other Liabilities, Fair Value Disclosure	98,350	83,845
Liabilities, Fair Value Disclosure	98,350	83,845
Redeemable Noncontrolling Interest Operating Partnership Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	678	18,710
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	678	18,710
Derivative Liability	2,485
Derivative liability, fair value	2,927
Other Liabilities, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	5,412	0
Redeemable Noncontrolling Interest Operating Partnership Fair Value Disclosure	430,149	363,144
Fair Value, Inputs, Level 3 [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	0	0
Other Assets, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	0	0
Derivative Liability	0
Derivative liability, fair value	0
Other Liabilities, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure	0	0
Redeemable Noncontrolling Interest Operating Partnership Fair Value Disclosure	$ 0	$ 0