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Derivative and Other Fair Value Instruments (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]        
Fair Value Of Serp Investments $ 105,942 $ 104,463    
Assets, Fair Value Disclosure 109,597 106,392    
Other Liabilities, Fair Value Disclosure 105,942 104,463    
Liabilities, Fair Value Disclosure 106,615 118,567    
Redeemable Noncontrolling Interests – Operating Partnership 566,783 500,733 $ 363,144 $ 398,372
Fair Value, Inputs, Level 1 [Member]        
Derivatives, Fair Value [Line Items]        
Fair Value Of Serp Investments 105,942 104,463    
Assets, Fair Value Disclosure 105,942 104,463    
Other Liabilities, Fair Value Disclosure 105,942 104,463    
Liabilities, Fair Value Disclosure 105,942 104,463    
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 3,655 1,929    
Other Liabilities, Fair Value Disclosure 0 0    
Liabilities, Fair Value Disclosure 673 14,104    
Redeemable Noncontrolling Interests – Operating Partnership 566,783 500,733    
Fair Value, Inputs, Level 3 [Member]        
Derivatives, Fair Value [Line Items]        
Fair Value Of Serp Investments 0 0    
Assets, Fair Value Disclosure 0 0    
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 3,655 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 3,655 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    
Derivative liability, fair value 673 14,104    
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 1 [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset   0    
Derivative liability, fair value 0 0    
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 2 [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset   332    
Derivative liability, fair value 673 14,104    
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 3 [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset   0    
Derivative liability, fair value $ 0 $ 0