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Debt - Line of Credit (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Total outstanding credit agreements, net $ 350,730  
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility    
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility 300,000 $ 300,000
Issuance costs, net of accumulated amortization (1,270) (1,615)
Total, unsecured term loan credit facilities, net 298,730 298,385
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche    
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility $ 50,000 $ 50,000
Interest rate (percent) 3.4038% 2.6607%
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche | One-month LIBOR    
Line of Credit Facility [Line Items]    
Basis spread on variable interest rate (percent) 1.30% 1.30%
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche | Interest Rate Swap One    
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility $ 90,000 $ 90,000
Interest rate (percent) 2.651% 2.651%
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche | Interest Rate Swap One | One-month LIBOR    
Line of Credit Facility [Line Items]    
Derivative, basis spread on variable rate (percent) 1.30%  
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche | Interest Rate Swap Two    
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility $ 60,000 $ 60,000
Interest rate (percent) 2.6525% 2.6525%
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche | Interest Rate Swap Two | One-month LIBOR    
Line of Credit Facility [Line Items]    
Derivative, basis spread on variable rate (percent) 1.30%  
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 7-Year Tranche    
Line of Credit Facility [Line Items]    
Unsecured term loan credit facility $ 100,000 $ 100,000
Interest rate (percent) 3.7038% 2.9607%
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 7-Year Tranche | One-month LIBOR    
Line of Credit Facility [Line Items]    
Basis spread on variable interest rate (percent) 1.60% 1.60%
Revolving Credit Facility | KeyBanc Capital Markets and J.P. Morgan Securities LLC Amended and Restated    
Line of Credit Facility [Line Items]    
Unsecured revolving line of credit - variable rate $ 52,000  
Interest rate (percent) 3.52106%  
Revolving Credit Facility | KeyBanc Capital Markets and J.P. Morgan Securities LLC Amended and Restated | One-month LIBOR    
Line of Credit Facility [Line Items]    
Basis spread on variable interest rate (percent) 1.40%