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Finance Costs and Refund Interest Income	12 Months Ended
Finance Costs and Refund Interest Income	Dec. 31, 2018
Analysis of income and expense [abstract]
Finance Costs and Refund Interest Income	FINANCE COSTS AND REFUND INTEREST INCOME: Our finance costs are comprised primarily of interest expenses and fees related to our applicable credit facility, interest rate swap agreements, accounts receivable sales program and the SFP. See notes 5 and 12. Refund interest income represents the refund of interest on cash previously held on account with tax authorities in connection with the resolution of certain previously-disputed tax matters in 2016. See note 20.