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Earnings Per Share | 12 Months Ended
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Dec. 31, 2011
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Earnings per Share | NOTE 7 EARNINGS PER SHARE Basic earnings per share attributable to U.S. Cellular shareholders is computed by dividing N et income attributable to U.S. Cellular shareholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share attributable to U.S. Cellular shareholders is computed by dividing N et income attributable to U.S. Cellular shareholders by the weighted average number of common shares outstanding during the period adjusted to include the effect s of potentially dilutive securities. Potentially dilutive securities primarily include incremental shares issuable upon exercise of outstanding stock options and the vesting of restricted stock units. The amounts used in computing Earnings per Common and Series A Common Share and the effect s of potentially dilutive securities on the weighted average number of Common and Series A Common Shares are as follows:
Year ended December 31, |  | 2011 |  | 2010 |  | 2009
(Dollars and shares in thousands, |  |  |  |  |  |
| except earnings per share) |  |  |  |  |  |  |  |  |
Net income attributable to U.S. Cellular shareholders |  | $ | 175,041 |  | $ | 136,074 |  | $ | 209,547
Weighted average number of shares used |  |  |  |  |  |  |  |
| in basic earnings per share |  |  | 84,877 |  |  | 86,128 |  | 86,946
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
| Stock options |  |  | 114 |  |  | 89 |  |  | 21
| Restricted stock units |  |  | 344 |  |  | 301 |  |  | 201
Weighted average number of shares used |  |  |  |  |  |  |  |  |
| in diluted earnings per share |  |  | 85,335 |  |  | 86,518 |  |  | 87,168
Basic earnings per share attributable to |  |  |  |  |  |  |  |  |
| U.S. Cellular shareholders |  | $ | 2.06 |  | $ | 1.58 |  | $ | 2.41
Diluted earnings per share attributable to |  |  |  |  |  |  |  |  |
| U.S. Cellular shareholders |  | $ | 2.05 |  | $ | 1.57 |  | $ | 2.40
Certain Common Shares issuable upon the exercise of s tock options or vesting of r estricted stock units were not included in average diluted shares outstanding for the calculation of Diluted earnings per share because their effects were antidilutive. The number of such Common Shares excluded is shown in the table below.
|  |  | 2011 |  | 2010 |  | 2009
(Shares in thousands) |  |  |  |  |
Stock options |  | 1,399 |  | 1,771 |  | 2,045
Restricted stock units |  | 215 |  | 224 |  | 193

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -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 -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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