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Goodwill and Intangible Assets - Carrying Amounts of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward] |  |
Gross cost, beginning balance | $ 1,301,120 | $ 1,392,861
Additions due to an acquisition |  | 5,250
Intangible assets fully amortized | (33,262) | (107,258)
Foreign currency translation impact | 11,528 | 10,267
Gross cost, ending balance | 1,279,386 | 1,301,120
Accumulated amortization | (472,388) | (376,033)
Finite-lived intangible assets, net | 806,998 | 925,087
Customer Relationships |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Gross cost, beginning balance | 1,145,109 | 1,131,656
Additions due to an acquisition |  | 3,600
Intangible assets fully amortized | (2,394) | 0
Foreign currency translation impact | 11,495 | 9,853
Gross cost, ending balance | 1,154,210 | 1,145,109
Accumulated amortization | (381,776) | (283,369)
Finite-lived intangible assets, net | $ 772,434 | 861,740
Customer Relationships | Minimum |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Remaining amortization period | 3 years |
Customer Relationships | Maximum |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Remaining amortization period | 13 years |
Software |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Gross cost, beginning balance | $ 111,033 | 110,701
Additions due to an acquisition |  |
Intangible assets fully amortized | (787) | 0
Foreign currency translation impact | 351 | 332
Gross cost, ending balance | 110,597 | 111,033
Accumulated amortization | (83,320) | (61,564)
Finite-lived intangible assets, net | $ 27,277 | 49,469
Software | Minimum |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Remaining amortization period | 2 years |
Software | Maximum |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Remaining amortization period | 7 years |
Content |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Gross cost, beginning balance | $ 14,140 | 98,842
Additions due to an acquisition |  | 1,200
Intangible assets fully amortized | (9,929) | (85,900)
Foreign currency translation impact | (246) | (2)
Gross cost, ending balance | 3,965 | 14,140
Accumulated amortization | (3,595) | (11,225)
Finite-lived intangible assets, net | $ 370 | 2,915
Content | Minimum |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Remaining amortization period | 2 years |
Content | Maximum |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Remaining amortization period | 3 years |
Other |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Gross cost, beginning balance | $ 30,838 | 51,662
Additions due to an acquisition |  | 450
Intangible assets fully amortized | (20,152) | (21,358)
Foreign currency translation impact | (72) | 84
Gross cost, ending balance | 10,614 | 30,838
Accumulated amortization | (3,697) | (19,875)
Finite-lived intangible assets, net | $ 6,917 | $ 10,963
Other | Minimum |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Remaining amortization period | 2 years |
Other | Maximum |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Remaining amortization period | 11 years |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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