Acquisition - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Noncurrent assets:
Goodwill	$ 1,279,472	$ 909,691
SpeedPay
Current assets:
Cash and cash equivalents	135
Receivables, net of allowances	18,422
Settlement assets	239,604
Prepaid expenses	317
Other current assets	19,585
Total current assets acquired	278,063
Noncurrent assets:
Goodwill	367,142
Other noncurrent assets	3,745
Total assets acquired	981,950
Current liabilities:
Accounts payable	6,743
Settlement liabilities	212,892
Employee compensation	1,959
Other current liabilities	3,802
Total current liabilities acquired	225,396
Noncurrent liabilities:
Other noncurrent liabilities	1,219
Total liabilities acquired	226,615
Net assets acquired	755,335
SpeedPay | Software
Noncurrent assets:
Finite-lived intangible assets	$ 113,600
Noncurrent liabilities:
Weighted Average Useful Lives	7 years
SpeedPay | Customer relationships
Noncurrent assets:
Finite-lived intangible assets	$ 208,500
Noncurrent liabilities:
Weighted Average Useful Lives	15 years
SpeedPay | Trademarks
Noncurrent assets:
Finite-lived intangible assets	$ 10,900
Noncurrent liabilities:
Weighted Average Useful Lives	5 years