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Fair Value Measurements and Disclosures (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Liabilities    
Secured debt (Notes 3, 7, 8 and 17) $ 381,918 $ 546,292
Unsecured Debt 1,856,590 1,783,121
Unsecured line of credit 0 140,000
Carrying Value    
Liabilities    
Secured debt (Notes 3, 7, 8 and 17) [1] 381,918 546,292
Unsecured Debt [2] 1,856,590 1,783,121
Unsecured line of credit [1] 0 140,000
Carrying Value | Unsecured Debt [Member] | Fair Value (Level 1) [Member]    
Liabilities    
Unsecured Debt   1,269,400
Carrying Value | Unsecured Debt [Member] | Fair Value (Level 2) [Member]    
Liabilities    
Unsecured Debt   513,700
Fair Value    
Liabilities    
Secured debt (Notes 3, 7, 8 and 17) [1] 391,611 559,483
Unsecured Debt [2] 1,898,863 1,858,492
Unsecured line of credit [1] $ 0 145,051
Fair Value | Unsecured Debt [Member] | Fair Value (Level 1) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure   1,322,200
Fair Value | Unsecured Debt [Member] | Fair Value (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure   $ 536,300
[1] Fair value calculated using Level II inputs, which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets
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