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Financial Instruments and Fair Value Measurements (Details Textual) - Interest Rate Swap [Member] - Not Designated as Accounting Hedge [Member]
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Agreement
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Derivative instrument, number of outstanding agreement | Agreement 1
Derivative instrument, notional amount $ 650.0
Derivative instrument, expiration date Dec. 31, 2020
Level 2 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Fair value liability $ 6.5