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Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments (in segments) | segment |  |  | 2 |
Operating revenues | $ 230,577 | $ 201,613 | $ 803,924 | $ 677,162
Operating expenses | 235,662 | 188,561 | 705,448 | 582,543
Operating income | (5,085) | 13,052 | 98,476 | 94,619
Account Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 186,623 |  | 597,350 |
Operating income |  |  | 135,350 | 109,061
Processing and Settlement Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 43,954 |  | 206,574 |
Operating income |  |  | 71,469 | 64,575
Operating segments | Account Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 193,763 | 170,160 | 620,462 | 512,967
Operating expenses | 149,876 | 135,693 | 485,112 | 403,906
Operating income | 43,887 | 34,467 |  |
Operating segments | Processing and Settlement Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 44,150 | 39,088 | 207,914 | 187,862
Operating expenses | 42,923 | 39,606 | 136,445 | 123,287
Operating income | 1,227 | (518) |  |
Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | (7,336) | (7,635) | (24,452) | (23,667)
Operating expenses | 42,863 | 13,262 | 83,891 | 55,350
Operating income | $ (50,199) | $ (20,897) | $ (108,343) | $ (79,017)

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