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NET INCOME PER SHARE | 12 Months Ended
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Dec. 31, 2011
NET INCOME PER SHARE [Abstract] |
NET INCOME PER SHARE | (18) NET INCOME PER SHARE The following table sets forth the computation of basic and diluted net income per share for the periods indicated (amounts in thousands):
|  |  |  | Year Ended December 31,
|  |  |  | 2011 |  | 2010 |  | 2009
Shares used in basic earnings per share calculation | 56,669 |  | 60,361 |  | 62,891
| Effect of dilutive securities: |  |  |  |  |
|  | Stock options | 727 |  | 874 |  | 814
|  | Restricted stock units | 564 |  | 557 |  | 533
|  | Performance-based restricted stock units | 3 |  | - |  | -
|  |  | Total effects of dilutive securities | 1,294 |  | 1,431 |  | 1,347
Shares used in dilutive earnings per share calculation | 57,963 |  | 61,792 |  | 64,238
For the years ended December 31, 2011, 2010 and 2009, 0.1 million, 0.1 million and 0.4 million, respectively, of options to purchase shares of common stock were outstanding but not included in the computation of diluted net income per share because the exercise price exceeded the value of the shares and the effect would have been anti-dilutive. For the years ended December 31, 2011, 2010 and 2009, restricted stock units of 0.6 million, 1.1 million, and 0.8 million, respectively, were outstanding but not included in the computation of diluted net income per share because the effect would have been anti-dilutive. For the years ended December 31, 2011, 2010 and 2009, there were no performance-based restricted stock units outstanding but not included in the computation of diluted net income per share. For the years ended December 31, 2011, 2010 and 2009, restricted stock units that vest based on the Company achieving specified operating income performance targets, of 0.1 million, 0.1 million and 0.1 million, respectively, were outstanding but not included in the computation of diluted net income per share because they were not determined to be contingently issuable.

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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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