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Derivative and Other Fair Value Instruments (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]        
Fair Value Of Serp Investments $ 124,420 $ 105,942    
Assets, Fair Value Disclosure 126,277 109,597    
Other Liabilities, Fair Value Disclosure 124,420 105,942    
Liabilities, Fair Value Disclosure 124,420 106,615    
Redeemable Noncontrolling Interests – Operating Partnership 442,092 566,783 $ 500,733 $ 363,144
Fair Value, Inputs, Level 1 [Member]        
Derivatives, Fair Value [Line Items]        
Fair Value Of Serp Investments 124,420 105,942    
Assets, Fair Value Disclosure 124,420 105,942    
Other Liabilities, Fair Value Disclosure 124,420 105,942    
Liabilities, Fair Value Disclosure 124,420 105,942    
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 1,857 3,655    
Other Liabilities, Fair Value Disclosure 0 0    
Liabilities, Fair Value Disclosure 0 673    
Redeemable Noncontrolling Interests – Operating Partnership 442,092 566,783    
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 1,857 3,655    
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 1,857 3,655    
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 liability, fair value   673    
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 1 [Member]        
Derivatives, Fair Value [Line Items]        
Derivative liability, fair value   0    
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 2 [Member]        
Derivatives, Fair Value [Line Items]        
Derivative liability, fair value   673    
Forward Starting Swaps [Member] | Fair Value, Inputs, Level 3 [Member]        
Derivatives, Fair Value [Line Items]        
Derivative liability, fair value   $ 0