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Derivative and Other Fair Value Instruments (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Fair Value Of Serp Investments $ 99,641 $ 104,463
Assets, Fair Value Disclosure 103,596 106,392
Derivative liability, fair value   14,104
Other Liabilities, Fair Value Disclosure 99,641 104,463
Liabilities, Fair Value Disclosure 99,641 118,567
Redeemable Noncontrolling Interests Operating Partnership 488,178 500,733
Fair Value, Inputs, Level 1 [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value Of Serp Investments 99,641 104,463
Assets, Fair Value Disclosure 99,641 104,463
Derivative liability, fair value   0
Other Liabilities, Fair Value Disclosure 99,641 104,463
Liabilities, Fair Value Disclosure 99,641 104,463
Redeemable Noncontrolling Interests Operating Partnership 0 0
Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value Of Serp Investments 0 0
Assets, Fair Value Disclosure 3,955 1,929
Derivative liability, fair value   14,104
Other Liabilities, Fair Value Disclosure 0 0
Liabilities, Fair Value Disclosure 0 14,104
Redeemable Noncontrolling Interests Operating Partnership 488,178 500,733
Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Fair Value Of Serp Investments 0 0
Assets, Fair Value Disclosure 0 0
Derivative liability, fair value   0
Other Liabilities, Fair Value Disclosure 0 0
Liabilities, Fair Value Disclosure 0 0
Redeemable Noncontrolling Interests Operating Partnership 0 0
Fair Value Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 3,955 1,597
Fair Value Hedging [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 0
Fair Value Hedging [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset 3,955 1,597
Fair Value Hedging [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 0 0
Forward Starting Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset   332
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset   0
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset   332
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset   $ 0