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Derivative and Other Fair Value Instruments (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Supplemental Executive Retirement Plan $ 120,232 $ 105,942
Assets, Fair Value Disclosure 128,450 109,597
Supplemental Executive Retirement Plan 120,232 105,942
Financial and Nonfinancial Liabilities, Fair Value Disclosure 125,145 106,615
Redeemable Noncontrolling Interests – Operating Partnership 441,892 566,783
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)    
Derivatives, Fair Value [Line Items]    
Supplemental Executive Retirement Plan 120,232 105,942
Assets, Fair Value Disclosure 120,232 105,942
Supplemental Executive Retirement Plan 120,232 105,942
Financial and Nonfinancial Liabilities, Fair Value Disclosure 120,232 105,942
Redeemable Noncontrolling Interests – Operating Partnership 0 0
Significant Other Observable Inputs (Level 2)    
Derivatives, Fair Value [Line Items]    
Supplemental Executive Retirement Plan 0 0
Assets, Fair Value Disclosure 8,218 3,655
Supplemental Executive Retirement Plan 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 4,913 673
Redeemable Noncontrolling Interests – Operating Partnership 441,892 566,783
Significant Unobservable Inputs (Level 3)    
Derivatives, Fair Value [Line Items]    
Supplemental Executive Retirement Plan 0 0
Assets, Fair Value Disclosure 0 0
Supplemental Executive Retirement Plan 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Redeemable Noncontrolling Interests – Operating Partnership 0 0
Fair Value Hedges    
Derivatives, Fair Value [Line Items]    
Derivative Asset 8,218 3,655
Fair Value Hedges | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 0
Fair Value Hedges | Significant Other Observable Inputs (Level 2)    
Derivatives, Fair Value [Line Items]    
Derivative Asset 8,218 3,655
Fair Value Hedges | Significant Unobservable Inputs (Level 3)    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 0
Forward Starting Swaps    
Derivatives, Fair Value [Line Items]    
Derivative Liability 4,913 673
Forward Starting Swaps | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0 0
Forward Starting Swaps | Significant Other Observable Inputs (Level 2)    
Derivatives, Fair Value [Line Items]    
Derivative Liability 4,913 673
Forward Starting Swaps | Significant Unobservable Inputs (Level 3)    
Derivatives, Fair Value [Line Items]    
Derivative Liability $ 0 $ 0