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Supplemental Schedule of Noncash Financing Activities	12 Months Ended
Supplemental Schedule of Noncash Financing Activities	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Supplemental Schedule of Noncash Financing Activities	Supplemental schedule of noncash financing activities: As of December 31, 2018 $70.5 million of the upfront cash consideration of Weizmann, AHA Taxis, Business Travels, Pearl International Tours & Travels, and Lawson remained unfunded and is included in Other current liabilities in the Company's Consolidated Balance Sheet, see Note 12. During 2018 there were 8,875 shares, totaling $467 thousand, used to satisfy exercise costs and the recipients' income tax obligations related to stock options exercised and restricted stock vesting. During 2017 there were 6,134 shares, totaling $398 thousand, used to satisfy exercise costs and the recipients' income tax obligations related to stock options exercised and restricted stock vesting. During 2016 there were 17,185 shares, totaling $998 thousand, used to satisfy exercise costs and the recipients' income tax obligations related to stock options exercised and restricted stock vesting. As of December 31, 2018 there were 200,000 shares totaling $8.8 million of share repurchases that were not settled until January 2019. As of December 31, 2016 there were 109,475 shares totaling $6.4 million of share repurchases that were not settled until January 2017.