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Fair Value (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net $ (27,515,000) $ 16,195,000
Debt, net 2,199,301,000 2,202,676,000
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Long-term Debt, Fair Value 2,254,302,000 2,195,958,000
Recurring | Interest rate swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Interest rate swap asset 2,273,000 17,215,000
Interest rate swap liability (30,190,000) (1,020,000)
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net (27,917,000) 16,195,000
Recurring | Level 1 | Interest rate swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Interest rate swap asset 0 0
Interest rate swap liability 0 0
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net 0 0
Recurring | Fair Value, Inputs, Level 2 [Member] | Interest rate swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Interest rate swap asset 2,273,000 17,215,000
Interest rate swap liability (30,190,000) (1,020,000)
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net (27,917,000) 16,195,000
Recurring | Fair Value, Inputs, Level 3 [Member] | Interest rate swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Interest rate swap asset 0 0
Interest rate swap liability 0 0
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net 0 0
Senior Notes [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Long-term Debt, Fair Value 540,618,000 492,554,000
Unsecured Debt [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Long-term Debt, Fair Value 1,176,459,000 1,175,000,000
Unsecured Debt 1,170,438,000 1,169,165,000
Secured Debt [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Long-term Debt, Fair Value 537,225,000 528,404,000
Secured Debt $ 527,085,000 $ 528,189,000