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Unsecured Line of Credit (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
yr
mo
Dec. 31, 2015
USD ($)
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity $ 1,000,000  
Line of Credit Facility, Expiration Date Jul. 26, 2018  
Line of Credit Facility, Frequency of Commitment Fee Payment quarterly  
Line of Credit Facility, Amount Outstanding $ 0 $ 0
Leverage Ratio, Maximum 60.00%  
Leverage Ratio Maximum Increasing Limit 65.00%  
Leverage Ratio Reduction Limit 60.00%  
Leverage Ratio Reduction Period, Years | yr 1  
Maximum Secured Debt Leverage Ratio 55.00%  
Fixed Charge Coverage Ratio Minimum. 1.40  
Maximum Unsecured Debt Leverage Ratio 60.00%  
Unsecured Debt Leverage Ratio Maximum Increasing Limit 65.00%  
Unsecured Debt Leverage Ratio Reduction Limit 60.00%  
Unsecured Debt Leverage Ratio Reduction Period, Years | yr 1  
Unsecured Debt Interest Coverage Ratio Minimum. 1.75  
Alternative Base Interest Rate Calculation [Member]    
Line of Credit Facility [Line Items]    
Amount added to Federal Funds Rate to Calculate Interest Rate 0.50%  
LIBOR Period Used to Calculate Interest Rate (in months) | mo 1  
Amount added to LIBOR to Calculate Interest Rate 1.00%  
Maximum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity $ 1,500,000  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.35%  
Maximum [Member] | Interest Rate Based on LIBOR or CDOR [Member]    
Line of Credit Facility [Line Items]    
Margin added to Calculated Interest Rate 1.70%  
Maximum [Member] | Alternative Base Interest Rate Calculation [Member]    
Line of Credit Facility [Line Items]    
Margin added to Calculated Interest Rate 0.70%  
Minimum [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.125%  
Minimum [Member] | Interest Rate Based on LIBOR or CDOR [Member]    
Line of Credit Facility [Line Items]    
Margin added to Calculated Interest Rate 0.925%  
Minimum [Member] | Alternative Base Interest Rate Calculation [Member]    
Line of Credit Facility [Line Items]    
Margin added to Calculated Interest Rate 0.00%  
Rate Based on Current Credit Rating [Member]    
Line of Credit Facility [Line Items]    
Line Of Credit Facility Extension Fee 0.15%  
Rate Based on Current Credit Rating [Member] | Interest Rate Based on LIBOR or CDOR [Member]    
Line of Credit Facility [Line Items]    
Margin added to Calculated Interest Rate 1.00%  
Rate Based on Current Credit Rating [Member] | Alternative Base Interest Rate Calculation [Member]    
Line of Credit Facility [Line Items]    
Margin added to Calculated Interest Rate 0.00%