Other Expenses (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2017 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Other Income And Expenses [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Professional Services and Marketing Costs and Other Expenses | The following items are included in the consolidated income statements as professional services and marketing costs and other expenses for the years ended December 31:
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