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Contract Acquisition Costs, Net - Estimated Future Amortization on Payments for Processing and Conversion (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Conversion  
Contractual arrangements  
2018 $ 36,890
2019 29,673
2020 23,475
2021 21,491
2022 16,581
Processing rights  
Contractual arrangements  
2018 27,211
2019 24,210
2020 21,786
2021 19,275
2022 $ 15,123