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Acquisitions (Details Textual) - Western Pacific Enterprises [Member] - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended
Oct. 28, 2016
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2017
Business Acquisition [Line Items]        
Business Acquisition, Transaction Costs   $ 0.4 $ 0.4 $ 0.4
Business Combination Compensation Expenses On Contingent Payment       0.2
Business Combination, Contingent Consideration, Liability   2.2 2.2 $ 2.2
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ 0.8      
Payments to Acquire Businesses, Net of Cash Acquired $ 12.1      
Other Income [Member]        
Business Acquisition [Line Items]        
Other Income   $ 0.9 $ 1.7