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Indebtedness - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 28, 2019
USD ($)
Dec. 26, 2018
USD ($)
May 04, 2018
USD ($)
Mar. 07, 2018
USD ($)
Jul. 15, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                      
Loss on early extinguishment of debt                 $ 6,374 $ 7,122 $ 493
Real estate properties, net           $ 763,674     459,421 763,674  
Mortgage notes payable, net           26,482     25,691 $ 26,482  
Mortgage notes | 97 Newberry Road                      
Debt Instrument [Line Items]                      
Amount of debt, redeemed, defeased, or prepaid           4,900          
Loss on early extinguishment of debt           $ 600          
Mortgage notes | 33 Stiles Lane                      
Debt Instrument [Line Items]                      
Amount of debt, redeemed, defeased, or prepaid             $ 2,000        
Loss on early extinguishment of debt                     200
Mortgage notes | Parkshore Plaza                      
Debt Instrument [Line Items]                      
Amount of debt, redeemed, defeased, or prepaid               $ 41,300      
Loss on early extinguishment of debt                     100
Loan facility, 5-year term | LIBOR | Minimum                      
Debt Instrument [Line Items]                      
Basis points on variable rate     0.90%                
Loan facility, 5-year term | LIBOR | Maximum                      
Debt Instrument [Line Items]                      
Basis points on variable rate     1.80%                
Loan facility, 7-year term | LIBOR | Minimum                      
Debt Instrument [Line Items]                      
Basis points on variable rate     1.40%                
Loan facility, 7-year term | LIBOR | Maximum                      
Debt Instrument [Line Items]                      
Basis points on variable rate     2.35%                
5.875% Senior Unsecured Notes due 2020                      
Debt Instrument [Line Items]                      
Amount of debt, redeemed, defeased, or prepaid $ 250,000                    
Loss on early extinguishment of debt                 $ 6,400    
Interest rate stated percentage 5.875%                    
5.75% Senior Unsecured Notes due 2024                      
Debt Instrument [Line Items]                      
Amount of debt, redeemed, defeased, or prepaid       $ 175,000              
Loss on early extinguishment of debt       $ 4,900              
Interest rate stated percentage       5.75%              
6.65% Senior Unsecured Notes due 2018                      
Debt Instrument [Line Items]                      
Amount of debt, redeemed, defeased, or prepaid         $ 250,000            
Loss on early extinguishment of debt                     $ 200
Interest rate stated percentage         6.65%            
Mortgage notes                      
Debt Instrument [Line Items]                      
Number of real estate properties secured by mortgage | property                 1    
Real estate properties, net                 $ 43,200    
Mortgage notes payable, net                 $ 25,700    
Revolving credit facility | Minimum                      
Debt Instrument [Line Items]                      
Commitment fee percentage     0.125%                
Revolving credit facility | Maximum                      
Debt Instrument [Line Items]                      
Commitment fee percentage     0.30%                
Revolving credit facility | Loan facility, 5-year term and 7-year term                      
Debt Instrument [Line Items]                      
Amount of debt, redeemed, defeased, or prepaid     $ 400,000                
Loss on early extinguishment of debt     $ 1,500                
Revolving credit facility | Loan facility, 5-year term                      
Debt Instrument [Line Items]                      
Debt instrument, term     5 years                
Revolving credit facility | Loan facility, 7-year term                      
Debt Instrument [Line Items]                      
Debt instrument, term     7 years                
Revolving credit facility | Unsecured revolving credit facility | Line of credit                      
Debt Instrument [Line Items]                      
Loss on early extinguishment of debt   $ 200