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Research and Development Costs	9 Months Ended
Research and Development Costs	Sep. 30, 2017
Research And Development [Abstract]
Research and Development Costs	6. Research and Development Costs Research and development costs related to software development totaled $3.3 million and $11.8 million for the three and nine months ended September 30, 2017, respectively, and $4.5 million and $13.0 million for the three and nine months ended September 30, 2016 respectively. Research and development costs are included in “Selling, general and administrative expenses” on the Condensed Consolidated Statements of Comprehensive Income.