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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Components of Accumulated Other Comprehensive Loss | The components of accumulated other comprehensive loss are as follows (in thousands):
|  | Foreign Currency Translation Adjustments |  |  | Change in Fair Value of Derivative Instruments |  |  | Pension Plan |  |  | Total |
Balance at December 31, 2020 |  | $ | (373,101 | ) |  | $ | 13,686 |  |  | $ | (11,950 | ) |  | $ | (371,365 | )
Foreign currency translation (loss) gain |  |  | (4,293 | ) |  |  | — |  |  |  | 33 |  |  |  | (4,260 | )
Gain on derivative instruments, net of tax of $0.1 million |  |  | — |  |  |  | 19 |  |  |  | — |  |  |  | 19 |
U.K. Sale |  |  | 377,394 |  |  |  | (13,705 | ) |  |  | 11,917 |  |  |  | 375,606 |
Balance at March 31, 2021 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |

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