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Information about Geographic Areas	9 Months Ended
Information about Geographic Areas	Sep. 30, 2018
Segment Reporting [Abstract]
Information about Geographic Areas	13. Information about Geographic Areas Revenues from external customers attributable to foreign countries totaled $25,659 and $24,335 for the nine months ended September 30, 2018 and 2017, respectively. Net carrying value of long lived assets located in foreign countries totaled $2,882 and $3,571 as of September 30, 2018 and December 31, 2017, respectively. All other revenues from external customers and long lived assets relate to domestic operations.