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Fair Value of Financial Instruments (Details Textual)
$ in Millions
6 Months Ended
Jun. 30, 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 $ 1.1
Minimum  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Interest rate 4.40%
Maximum  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Interest rate 5.30%
Weighted Average  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Interest rate 4.70%
Significant Unobservable Inputs (Level 3)  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair value of note payable $ 93.5
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 229.9
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 182.5
Senior Notes | Significant Other Observable Inputs (Level 2) | Senior Notes Due 2024  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Fair value of long term debt 235.7
Senior Notes | 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 $ 253.5