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Debt - Narrative (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Nov. 05, 2015
Nov. 04, 2015
Feb. 03, 2015
Feb. 02, 2015
Debt Instrument [Line Items]            
Debt, net $ 589,994,000 $ 667,861,000        
Outstanding credit agreements 350,730,000          
Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity     $ 600,000,000 $ 300,000,000    
The Company            
Debt Instrument [Line Items]            
Recourse debt 3,000,000          
Mortgages payable            
Debt Instrument [Line Items]            
Mortgages payable, net 239,264,000 369,476,000        
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility            
Debt Instrument [Line Items]            
Long-term line of credit 300,000,000 300,000,000        
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche            
Debt Instrument [Line Items]            
Long-term line of credit $ 50,000,000 $ 50,000,000        
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 5-Year Tranche | One-month LIBOR            
Debt Instrument [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 | 7-Year Tranche            
Debt Instrument [Line Items]            
Long-term line of credit $ 100,000,000 $ 100,000,000        
Revolving Credit Facility | Wells Fargo, Merrill Lynch, Pierce Fenner & Smith, PNC Capital Markets Credit Facility | 7-Year Tranche | One-month LIBOR            
Debt Instrument [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            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         $ 600,000,000 $ 300,000,000
Short-term debt $ 52,000,000          
Line of credit facility, remaining borrowing capacity $ 248,000,000          
Extension option on line of credit, period 1 year          
Commitment fee 0.15%          
Revolving Credit Facility | KeyBanc Capital Markets and J.P. Morgan Securities LLC Amended and Restated | One-month LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable interest rate (percent) 1.40%