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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue [abstract] |
Revenue - Disaggregation |
| Uranium | Fuel services | Other | Total
Customer geographical region |  |  |  |  |  |  |  |
Americas | $ | 695,678 | $ | 191,791 | $ | 69,012 | $ | 956,481
Europe |  | 275,096 |  | 50,000 |  | 10,693 |  | 335,789
Asia |  | 713,282 |  | 72,198 |  | 13,911 |  | 799,391
| $ | 1,684,056 | $ | 313,989 | $ | 93,616 | $ | 2,091,661
Contract type |  |  |  |  |  |  |  |
Fixed-price | $ | 577,143 | $ | 293,400 | $ | 83,706 | $ | 954,249
Market-related |  | 1,106,913 |  | 20,589 |  | 9,910 |  | 1,137,412
| $ | 1,684,056 | $ | 313,989 | $ | 93,616 | $ | 2,091,661
| Uranium | Fuel services | Other | Total
Customer geographical region |  |  |  |  |  |  |  |
Americas | $ | 737,095 | $ | 209,285 | $ | 105,673 | $ | 1,052,053
Europe |  | 318,446 |  | 52,642 |  | 101,592 |  | 472,680
Asia |  | 518,527 |  | 50,961 |  | 62,631 |  | 632,119
| $ | 1,574,068 | $ | 312,888 | $ | 269,896 | $ | 2,156,852
Contract type |  |  |  |  |  |  |  |
Fixed-price | $ | 502,437 | $ | 287,104 | $ | 252,702 | $ | 1,042,243
Market-related |  | 1,071,631 |  | 25,784 |  | 17,194 |  | 1,114,609
| $ | 1,574,068 | $ | 312,888 | $ | 269,896 | $ | 2,156,852
Revenue - Contract liabilities |
|  | 2018 |  | 2017
Beginning of year | $ | 29,148 | $ | 29,423
Additions |  | 25,695 |  | 31,405
Recognized in revenue |  | (24,025) |  | (31,499)
Effect of movements in exchange rates |  | (91) |  | (181)
End of year | $ | 30,727 | $ | 29,148
Revenue - Remaining performance obligations |
|  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |  | Total
Uranium | $ | 277,396 | $ | 182,711 | $ | 110,353 | $ | 112,459 | $ | 107,362 | $ | 166,615 | $ | 956,896
Fuel services |  | 240,551 |  | 215,851 |  | 236,993 |  | 199,815 |  | 139,731 |  | 714,893 |  | 1,747,834
Other |  | 32,161 |  | 4,030 |  | 4,212 |  | - |  | - |  | - |  | 40,403
Total | $ | 550,108 | $ | 402,592 | $ | 351,558 | $ | 312,274 | $ | 247,093 | $ | 881,508 | $ | 2,745,133

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