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Fair Value of Financial Instruments (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Interest rate cash flow hedge reclassified as non-cash increase to interest expense in the next 12 months $ 375
Minimum | Assumed Mortgage Notes Payable  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Interest rate 4.30%
Maximum | Assumed Mortgage Notes Payable  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Interest rate 5.30%
Weighted Average | Assumed Mortgage Notes Payable  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Interest rate 4.70%
Significant Other Observable Inputs (Level 2) | Senior Notes 2024  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair value of long term debt $ 241,400
Significant Other Observable Inputs (Level 2) | Senior Notes Due 2023  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair value of long term debt 259,600
Significant Unobservable Inputs (Level 3) | Assumed Mortgage Notes Payable  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair value of note payable 93,900
Senior Notes | Significant Unobservable Inputs (Level 3) | Senior Notes Due 2027  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair value of long term debt 232,300
Senior Notes | Significant Unobservable Inputs (Level 3) | Senior Notes Due 2026  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair value of long term debt $ 184,000