Goodwill and Intangible Assets - Summary of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross | $ 305,715 | $ 283,108 |
| Accumulated Amortization | (130,115) | (100,557) |
| Net | 175,600 | 182,551 |
| Acquired Internal Use Software | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross | 14,000 | 14,000 |
| Accumulated Amortization | (14,000) | (14,000) |
| Net | 0 | 0 |
| Technology | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross | 68,550 | 68,550 |
| Accumulated Amortization | (32,749) | (25,639) |
| Net | 35,801 | 42,911 |
| Merchant Relationships | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross | 181,000 | 181,000 |
| Accumulated Amortization | (71,101) | (56,018) |
| Net | 109,899 | 124,982 |
| Other Intangibles | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Gross | 42,165 | 19,558 |
| Accumulated Amortization | (12,265) | (4,900) |
| Net | $ 29,900 | $ 14,658 |