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Common Shares (Tables)
12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Stock by Class
Change in Number of Shares
 
Number of ordinary shares

Balance at January 1, 2017
63,978,204

Issuance of shares under share option and free share plans (1)
2,106,893

Balance at December 31, 2017
66,085,097

Issuance of shares under share option and free share plans (2)
1,466,247

Balance at December 31, 2018 before Storetail deferred consideration and Share repurchase program
67,551,344

Storetail deferred consideration (see Note 2. Significant Events and Transactions of the Period)
156,859

Balance at December 31, 2018 after Storetail deferred consideration and before Share repurchase program
67,708,203

Share repurchase program (see Note 2. Significant Events and Transactions of the Period)
(3,459,119
)
Balance at December 31, 2018
64,249,084

(1) Adopted by the Board of Directors on March 1, 2017, April 27, 2017, June 30, 2017, July 27, 2017, October 26, 2017 and December 13, 2017.
(2) Adopted by the Board of Directors on March 1, 2018, March 16, 2018, April 25, 2018, June 26, 2018, July 26, 2018, July 27, 2018, October 25, 2018 and December 12, 2018.