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Concentrations of Risk	12 Months Ended
Concentrations of Risk	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Concentrations of Risk	Concentrations of Risk We generate a significant amount of revenues from large customers, including a customer that accounted for 12% of total revenues for the years ended December 31, 2018, 2017 and 2016. Financial instruments that potentially subject us to concentrations of credit risk consist primarily of trade receivables and interest rate swaps.