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Foreign Exchange	3 Months Ended
Foreign Exchange	Mar. 31, 2018
Foreign Currency [Abstract]
Foreign Exchange	Foreign Exchange: Foreign exchange transaction and revaluation losses were $3.2 million and $4.9 million for the three-month periods ended March 31, 2018 and 2017, respectively, and were included in Other (expenses) income, net, in our consolidated statements of income, with the unrealized portion included in Other, net, in our condensed consolidated statements of cash flows.