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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue Recognition |
Summary of revenue is disaggregation by geographical region |
|  | Three Months Ended
|  | June 30, 2018
|  |  | U.S. Drilling |  |  | Canada Drilling |  |  | International Drilling |  |  | Drilling Solutions |  |  | Rig Technologies |  |  | Other |  |  | Total
|  | (In thousands)
Lower 48 |  | $ | 219,389 |  | $ | — |  | $ | — |  | $ | 41,418 |  | $ | 57,573 |  | $ | — |  | $ | 318,380
U.S. Offshore Gulf of Mexico |  |  | 32,064 |  |  | — |  |  | — |  |  | 2,810 |  |  | — |  |  | — |  |  | 34,874
Alaska |  |  | 12,942 |  |  | — |  |  | — |  |  | 877 |  |  | 208 |  |  | — |  |  | 14,027
Canada |  |  | — |  |  | 17,442 |  |  | — |  |  | 1,425 |  |  | 10,222 |  |  | — |  |  | 29,089
Middle East & Asia |  |  | — |  |  | — |  |  | 240,508 |  |  | 9,007 |  |  | 6,503 |  |  | — |  |  | 256,018
Latin America |  |  | — |  |  | — |  |  | 87,809 |  |  | 3,665 |  |  | 1,919 |  |  | — |  |  | 93,393
Europe, Africa & CIS |  |  | — |  |  | — |  |  | 49,669 |  |  | 657 |  |  | 4,896 |  |  | — |  |  | 55,222
Eliminations & other |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (39,083) |  |  | (39,083)
Total |  | $ | 264,395 |  | $ | 17,442 |  | $ | 377,986 |  | $ | 59,859 |  | $ | 81,321 |  | $ | (39,083) |  | $ | 761,920
|  | Six Months Ended
|  | June 30, 2018
|  |  | U.S. Drilling |  |  | Canada Drilling |  |  | International Drilling |  |  | Drilling Solutions |  |  | Rig Technologies |  |  | Other |  |  | Total
|  | (In thousands)
Lower 48 |  | $ | 423,981 |  | $ | — |  | $ | — |  | $ | 85,687 |  | $ | 108,174 |  | $ | — |  | $ | 617,842
U.S. Offshore Gulf of Mexico |  |  | 53,055 |  |  | — |  |  | — |  |  | 6,109 |  |  | — |  |  | — |  |  | 59,164
Alaska |  |  | 28,361 |  |  | — |  |  | — |  |  | 1,443 |  |  | 344 |  |  | — |  |  | 30,148
Canada |  |  | — |  |  | 49,329 |  |  | — |  |  | 3,716 |  |  | 13,611 |  |  | — |  |  | 66,656
Middle East & Asia |  |  | — |  |  | — |  |  | 474,367 |  |  | 16,735 |  |  | 11,709 |  |  | — |  |  | 502,811
Latin America |  |  | — |  |  | — |  |  | 171,691 |  |  | 7,649 |  |  | 3,577 |  |  | — |  |  | 182,917
Europe, Africa & CIS |  |  | — |  |  | — |  |  | 100,773 |  |  | 1,168 |  |  | 8,575 |  |  | — |  |  | 110,516
Eliminations & other |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (73,940) |  |  | (73,940)
Total |  | $ | 505,397 |  | $ | 49,329 |  | $ | 746,831 |  | $ | 122,507 |  | $ | 145,990 |  | $ | (73,940) |  | $ | 1,496,114
|  | Three Months Ended
|  | June 30, 2017
|  |  | U.S. Drilling |  |  | Canada Drilling |  |  | International Drilling |  |  | Drilling Solutions |  |  | Rig Technologies |  |  | Other |  |  | Total
|  | (In thousands)
Lower 48 |  | $ | 160,126 |  | $ | — |  | $ | — |  | $ | 26,509 |  | $ | 56,595 |  | $ | — |  | $ | 243,230
U.S. Offshore Gulf of Mexico |  |  | 16,361 |  |  | — |  |  | — |  |  | 101 |  |  | — |  |  | — |  |  | 16,462
Alaska |  |  | 10,857 |  |  | — |  |  | — |  |  | 1,306 |  |  | 188 |  |  | — |  |  | 12,351
Canada |  |  | — |  |  | 17,121 |  |  | — |  |  | 1,322 |  |  | 1,564 |  |  | — |  |  | 20,007
Middle East & Asia |  |  | — |  |  | — |  |  | 222,294 |  |  | 1,819 |  |  | 2,838 |  |  | — |  |  | 226,951
Latin America |  |  | — |  |  | — |  |  | 103,920 |  |  | 614 |  |  | — |  |  | — |  |  | 104,534
Europe, Africa & CIS |  |  | — |  |  | — |  |  | 54,124 |  |  | 158 |  |  | — |  |  | — |  |  | 54,282
Eliminations & other |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (46,462) |  |  | (46,462)
Total |  | $ | 187,344 |  | $ | 17,121 |  | $ | 380,338 |  | $ | 31,829 |  | $ | 61,185 |  | $ | (46,462) |  | $ | 631,355
|  | Six Months Ended
|  | June 30, 2017
|  |  | U.S. Drilling |  |  | Canada Drilling |  |  | International Drilling |  |  | Drilling Solutions |  |  | Rig Technologies |  |  | Other |  |  | Total
|  | (In thousands)
Lower 48 |  | $ | 297,349 |  | $ | — |  | $ | — |  | $ | 48,829 |  | $ | 95,255 |  | $ | — |  | $ | 441,433
U.S. Offshore Gulf of Mexico |  |  | 29,667 |  |  | — |  |  | — |  |  | 186 |  |  | — |  |  | — |  |  | 29,853
Alaska |  |  | 22,262 |  |  | — |  |  | — |  |  | 2,437 |  |  | 314 |  |  | — |  |  | 25,013
Canada |  |  | — |  |  | 44,929 |  |  | — |  |  | 3,305 |  |  | 3,539 |  |  | — |  |  | 51,773
Middle East & Asia |  |  | — |  |  | — |  |  | 418,552 |  |  | 3,121 |  |  | 6,153 |  |  | — |  |  | 427,826
Latin America |  |  | — |  |  | — |  |  | 197,365 |  |  | 1,129 |  |  | — |  |  | — |  |  | 198,494
Europe, Africa & CIS |  |  | — |  |  | — |  |  | 102,644 |  |  | 187 |  |  | — |  |  | — |  |  | 102,831
Eliminations & other |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (83,318) |  |  | (83,318)
Total |  | $ | 349,278 |  | $ | 44,929 |  | $ | 718,561 |  | $ | 59,194 |  | $ | 105,261 |  | $ | (83,318) |  | $ | 1,193,905
Summary of contract assets, current and long-term contract liabilities | The opening and closing balances of our receivables, contract assets and current and long-term contract liabilities are as follows (in millions):
|  |  |  | Contract |  | Contract |  | Contract |  | Contract
|  | Contract |  | Assets |  | Assets |  | Liabilities |  | Liabilities
|  | Receivables |  | (Current) |  | (Long-term) |  | (Current) |  | (Long-term)
As of December 31, 2017 |  | $ | 738.0 |  | $ | 67.0 |  | $ | 46.9 |  | $ | 218.4 |  | $ | 135.0
As of June 30, 2018 |  | $ | 820.6 |  | $ | 61.7 |  | $ | 26.4 |  | $ | 182.2 |  | $ | 79.9

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