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Goodwill and Intangible Assets - Goodwill activity (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Goodwill, Roll forward
Goodwill, gross, at the beginning of the year			$ 403,129
Accumulated impairment losses			(24,291)
Goodwill, net, at the beginning of the year		$ 378,838
Business combinations		61
Foreign currency translation adjustment		(11,957)
Goodwill, net, at the end of the year	$ 366,942	366,942
Americas
Goodwill, Roll forward
Goodwill, gross, at the beginning of the year			268,049
Goodwill, net, at the beginning of the year		268,049
Business combinations		61
Foreign currency translation adjustment		(8,638)
Goodwill, net, at the end of the year	259,472	259,472
Europe
Goodwill, Roll forward
Goodwill, gross, at the beginning of the year			135,080
Accumulated impairment losses			$ (24,291)
Goodwill, net, at the beginning of the year		110,789
Foreign currency translation adjustment		(3,319)
Goodwill, net, at the end of the year	107,470	107,470
Delego Software
Goodwill, Roll forward
Goodwill, net, at the end of the year	22,688	$ 22,688
Delego Software \| Maximum
Goodwill, Roll forward
Goodwill acquired	$ 100