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Fair Value (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt, net $ 2,587,731,000 $ 2,195,707,000  
Total 69,050,000 (19,514,000)  
Impairment loss $ 0 13,500,000 $ 0
Number of Properties Impaired 2    
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term Debt, Fair Value $ 2,539,983,000 2,206,152,000  
Recurring | Interest rate swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap asset   4,297,000  
Interest rate swap liability (69,050,000) (24,187,000)  
Total (69,050,000) (19,890,000)  
Recurring | Level 1 | Interest rate swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap asset   0  
Interest rate swap liability 0 0  
Total 0 0  
Recurring | Level 2 | Interest rate swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap asset   4,297,000  
Interest rate swap liability (69,050,000) (24,187,000)  
Total (69,050,000) (19,890,000)  
Recurring | Level 3 | Interest rate swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap asset   0  
Interest rate swap liability 0 0  
Total 0 0  
Fair Value, Measurements, Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment loss   6,019,000  
Fair Value, Measurements, Nonrecurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment loss   0  
Fair Value, Measurements, Nonrecurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment loss   0  
Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment loss   6,019,000  
Senior Notes | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term Debt, Gross 495,759,000 500,484,000  
Long-term Debt, Fair Value 484,229,000 497,835,000  
Revolver and Term Loans, net      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unsecured Debt 1,568,304,000 1,168,793,000  
Revolver and Term Loans, net | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term Debt, Fair Value 1,543,636,000 1,176,068,000  
Mortgage loans, net | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt, net 523,668,000 526,430,000  
Long-term Debt, Fair Value $ 512,118,000 $ 532,249,000