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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Revenue: |  |  |  |
Separative work units | $ 330.3 | $ 331.0 | $ 638.8 | $ 597.6
Uranium | 67.8 | 69.6 | 81.8 | 85.2
Contract services revenue | 56.3 | 59.1 | 114.3 | 121.6
Total revenue | 454.4 | 459.7 | 834.9 | 804.4
Cost of sales: |  |  |  |
Separative work units and uranium | 368.6 | 358.6 | 675.8 | 625.8
Contract services costs | 52.6 | 57.0 | 112.0 | 107.8
Total cost of sales | 421.2 | 415.6 | 787.8 | 733.6
Gross profit | 33.2 | 44.1 | 47.1 | 70.8
Advanced technology costs | 33.5 | 26.0 | 60.2 | 51.7
Selling, general and administrative | 16.7 | 14.3 | 32.2 | 29.4
Other (income) |  | (10.3) | (3.7) | (20.0)
Operating income (loss) | (17.0) | 14.1 | (41.6) | 9.7
Interest expense | 0.1 | 0.1 | 0.1 | 0.1
Interest (income) | (0.1) | (0.1) | (0.3) | (0.2)
Income (loss) before income taxes | (17.0) | 14.1 | (41.4) | 9.8
Provision (benefit) for income taxes | 4.2 | 6.9 | (3.6) | 12.3
Net income (loss) | $ (21.2) | $ 7.2 | $ (37.8) | $ (2.5)
Net income (loss) per share - basic | $ (0.18) | $ 0.06 | $ (0.31) | $ (0.02)
Net income (loss) per share - diluted | $ (0.18) | $ 0.04 | $ (0.31) | $ (0.02)
Weighted-average number of shares outstanding: |  |  |  |
Basic | 121.1 | 112.9 | 120.3 | 112.3
Diluted | 121.1 | 161.4 | 120.3 | 112.3

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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