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Subsequent Events (Details Textual) - Revolving Credit Facility [Member] - USD ($)
$ in Millions
Jul. 31, 2018
Jun. 30, 2018
Dec. 31, 2016
Subsequent Event [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 84.0 $ 250.0
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 325.0