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Fair Value of Assets and Liabilities - Asset Measured at Fair Value (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value of Assets and Liabilities      
Loss on impairment of real estate $ 22,255 $ 8,630 $ 9,490
Recurring      
Fair Value of Assets and Liabilities      
Other liability 30,100    
Recurring | Level 1 inputs      
Fair Value of Assets and Liabilities      
Other liability 0    
Recurring | Level 2 inputs      
Fair Value of Assets and Liabilities      
Other liability 30,100    
Recurring | Level 3 inputs      
Fair Value of Assets and Liabilities      
Other liability 0    
Trenton, NJ | Discontinued Operations, Held-for-sale      
Fair Value of Assets and Liabilities      
Loss on impairment of real estate $ 9,454    
Number of impaired properties | property 1,000    
Costs to sell $ 682