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Revenue Recognition (Details 1) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Business Combination, Contingent Consideration, Asset [Abstract]    
Trade receivables - including affiliates, net $ 66,510,000 $ 73,943,000
Liabilities [Abstract]    
Deferred revenue 25,000,000 14,000,000
Deferred Revenue - Long Term $ 25,000 $ 35,750