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Other Investments	3 Months Ended
Other Investments	Mar. 31, 2018
Other Investments [Abstract]
Other Investments [Text Block]	Other Investments In March 2018, the Company made an initial equity investment of $19 million in its licensee in Greece (“Greece”), for a 20% ownership stake. In connection with this investment, the Company entered into an agreement to purchase an additional 20% equity interest, 10% in March 2019 and 10% in March 2020, for $20 million. The Company’s equity investment is recorded within other non-current assets. The Company’s share of Greece’s operating results are reported within operating expenses and are not material for the three months ended March 31, 2018.