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4. Debt Summary (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]    
Mortgage notes payable $ 109,592 $ 110,733
Unsecured term loan 249,089 249,036
Long-term Debt, Gross 1,407,819 1,262,176
Unsecured notes payable 837,895 837,323
Line of credit $ 197,819 50,926
Total Debt in Percentage 100.00%  
Debt, Weighted Average Interest Rate 4.50%  
Long Term Debt, Weighted Average Maturity in Years 4.4  
Fixed Rate Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Amount $ 850,000 850,000
Percentage of Total Debt 60.00%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 5.80%  
FixedInterestDebtMaturityInYears 5.0  
Unsecured Notes due 2021 [Member]    
Debt Instrument [Line Items]    
Unsecured notes payable $ 600,000 600,000
Percentage of Total Debt 42.00%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 5.875%  
Unsecured Debt Maturity, in Years 4.5  
Unsecured Notes due 2023 [Member]    
Debt Instrument [Line Items]    
Unsecured notes payable $ 250,000 [1] 250,000
Percentage of Total Debt 18.00%  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 5.625%  
Unsecured Debt Maturity, in Years 6.2  
Debt Instrument, Unamortized Discount $ (1,600)  
Floating Rate Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Amount $ 557,819 412,176
Percentage of Total Debt 40.00%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.50%  
VariableInterestDebtMaturityInYears 3.5  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of credit $ 197,819 50,926
Percentage of Total Debt 14.00%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.50%  
Unsecured Debt Maturity, in Years 3.3  
Unsecured Term Loan [Member]    
Debt Instrument [Line Items]    
Unsecured term loan $ 250,000 250,000
Percentage of Total Debt 18.00%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.50%  
Unsecured Debt Maturity, in Years 4.8  
AccThreeTermLoan [Member]    
Debt Instrument [Line Items]    
Term Loan $ 110,000 111,250
Percentage of Total Debt 8.00%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.50%  
Secured Debt Maturity, in Years 1.0  
Secured Debt [Member]    
Debt Instrument [Line Items]    
Mortgage notes payable $ 110,000 111,250
Percentage of Total Debt 8.00%  
Long-Term Debt, Secured Interest Rate 2.50%  
Secured Debt Maturity, in Years 1.0  
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Unsecured term loan $ 1,297,819 $ 1,150,926
Percentage of Total Debt 92.00%  
Long-Term Debt, Unsecured Interest Rate 4.70%  
Unsecured Debt Maturity, in Years 4.7  
[1] (2) Principal amount excludes original issue discount of $1.6 million