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Debt - Line of Credit (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility $ 300,000 $ 300,000
Revolving Credit Facility [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility 300,000 300,000
Debt issuance costs, net of accumulated amortization (1,817) (2,044)
Total, unsecured term loan credit facilities, net 298,183 297,956
5-Year Tranche [Member] | Revolving Credit Facility [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility $ 50,000 $ 50,000
Interest rate (percent) 2.3505% 1.9167%
7-Year Tranche [Member] | Revolving Credit Facility [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility $ 100,000 $ 100,000
Interest rate (percent) 2.6505% 2.2167%
One-month LIBOR [Member] | 5-Year Tranche [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable interest rate (percent) 1.30%  
One-month LIBOR [Member] | 5-Year Tranche [Member] | Revolving Credit Facility [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable interest rate (percent) 1.30% 1.30%
One-month LIBOR [Member] | 7-Year Tranche [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable interest rate (percent) 1.60%  
One-month LIBOR [Member] | 7-Year Tranche [Member] | Revolving Credit Facility [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable interest rate (percent) 1.60% 1.60%
Interest Rate Swap One [Member] | 5-Year Tranche [Member] | Revolving Credit Facility [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility $ 90,000 $ 90,000
Interest rate (percent) 1.351% 1.351%
Interest Rate Swap One [Member] | One-month LIBOR [Member] | 5-Year Tranche [Member] | Revolving Credit Facility [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Derivative, basis spread on variable rate (percent) 1.30%  
Interest Rate Swap Two [Member] | 5-Year Tranche [Member] | Revolving Credit Facility [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility $ 60,000 $ 60,000
Interest rate (percent) 1.3525% 1.3525%
Interest Rate Swap Two [Member] | One-month LIBOR [Member] | 5-Year Tranche [Member] | Revolving Credit Facility [Member] | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Derivative, basis spread on variable rate (percent) 1.30%