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Acquisitions (Details) $ in Thousands, € in Millions	1 Months Ended										6 Months Ended	12 Months Ended
Acquisitions (Details) $ in Thousands, € in Millions	Mar. 31, 2019 EUR (€)	Mar. 31, 2019 USD ($)	Oct. 31, 2018 EUR (€)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	May 31, 2018 USD ($)	Apr. 30, 2018 EUR (€)	Apr. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Allocation of purchase price
Goodwill											$ 354,454	$ 353,011
Other disclosures:
Book value of the investment											$ 1,893	$ 1,753
Trademarks
Acquisitions
Useful life of intangible assets			5 years	5 years
Card Processing \| Minimum
Acquisitions
Useful life of equipment											3 years	3 years
Card Processing \| Maximum
Acquisitions
Useful life of equipment											5 years	5 years
Office equipment \| Minimum
Acquisitions
Useful life of equipment											3 years	3 years
Office equipment \| Maximum
Acquisitions
Useful life of equipment											5 years	5 years
Computer software
Acquisitions
Useful life of equipment											3 years	3 years
Way 2 Pay Ltd
Acquisitions
Percentage of interest acquired		100.00%
Upfront payment \| €	€ 2.7
Total consideration transferred	3.0	$ 3,400
Holdback liability \| €	€ 0.3
Useful life of intangible assets	5 years	5 years
Allocation of purchase price
Amortizable intangible assets		$ 4,000
EVO Payments International Corp. - Canada
Acquisitions
Percentage of interest acquired										30.00%
Contingent consideration										$ 900
Reduction to members' deficit										400
Reduction to nonredeemable non-controlling interest										$ 500
Nationwide Payment Solutions, LLC
Acquisitions
Percentage of interest acquired									38.00%
Contingent consideration									$ 3,800
Reduction to members' deficit									20,100
Reduction to nonredeemable non-controlling interest									600
Upfront payment									$ 16,900
Liberbank, S.A
Acquisitions
Total consideration transferred							€ 7.9	$ 9,500
Liberbank, S.A \| Merchant contract portfolios
Acquisitions
Useful life of intangible assets							5 years	5 years
Liberbank, S.A \| Marketing alliance agreements
Acquisitions
Useful life of intangible assets							15 years	15 years
Liberbank, S.A \| Trademarks
Acquisitions
Useful life of intangible assets							15 years	15 years
Liberbank, S.A \| Card Processing
Acquisitions
Useful life of equipment							3 years	3 years
Nodus Technologies, Inc
Acquisitions
Percentage of interest acquired						100.00%
Total consideration transferred						$ 18,000
Holdback liability						$ 800
Nodus Technologies, Inc \| Minimum
Acquisitions
Useful life of equipment						5 years
Nodus Technologies, Inc \| Maximum
Acquisitions
Useful life of equipment						7 years
Nodus Technologies, Inc \| Merchant contract portfolios
Acquisitions
Useful life of intangible assets						15 years
Nodus Technologies, Inc \| Internally developed software
Acquisitions
Useful life of intangible assets						10 years
Nodus Technologies, Inc \| Non-competition agreements
Acquisitions
Useful life of intangible assets						3 years
Nodus Technologies, Inc \| Trademarks
Acquisitions
Useful life of intangible assets						20 years
Nodus Technologies, Inc \| Computer software
Acquisitions
Useful life of equipment						3 years
Federated
Acquisitions
Total consideration transferred					$ 38,200
Holdback liability					500
Acquisition related costs					400
Allocation of purchase price
Tangible assets acquired					1,702
Deferred tax liability					(1,357)
Amortizable intangible assets					12,600
Goodwill					33,677
Total purchase price					46,622
Other disclosures:
Book value of the investment					0
Gain on acquisition of unconsolidated investee					$ 8,400
Federated \| Merchant contract portfolios
Acquisitions
Useful life of intangible assets					10 years
Allocation of purchase price
Amortizable intangible assets					$ 11,400
Federated \| Trademarks
Acquisitions
Useful life of intangible assets					5 years
Allocation of purchase price
Amortizable intangible assets					$ 1,200
Federated US
Acquisitions
Percentage of interest acquired					67.00%
Federated Canada
Acquisitions
Percentage of interest acquired					100.00%
ClearONE
Acquisitions
Percentage of interest acquired			100.00%	100.00%
Total consideration transferred			€ 5.4	$ 6,300
Holdback liability \| €			€ 0.5
ClearONE \| Internally developed software
Acquisitions
Useful life of intangible assets			5 years	5 years
ClearONE \| Non-competition agreements \| Minimum
Acquisitions
Useful life of intangible assets			2 years	2 years
ClearONE \| Non-competition agreements \| Maximum
Acquisitions
Useful life of intangible assets			3 years	3 years
ClearONE \| Card Processing \| Minimum
Acquisitions
Useful life of equipment			3 years	3 years
ClearONE \| Card Processing \| Maximum
Acquisitions
Useful life of equipment			5 years	5 years