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NET INCOME PER SHARE (DILUTED SHARES TABLE) (DETAILS) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Shares used in basic earnings per share calculation | 50,439,000 | 50,732,000 | 51,861,000 | 52,347,000 | 53,262,000 | 54,093,000 | 55,125,000 | 56,493,000 | 51,338,000 | 54,738,000 | 56,669,000
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  | 417 | 378 | 727
Restricted stock units |  |  |  |  |  |  |  |  | 489 | 424 | 564
Performance-based restricted stock units |  |  |  |  |  |  |  |  |  |  | 3
Total effects of dilutive securities |  |  |  |  |  |  |  |  | 906 | 802 | 1,294
Shares used in dilutive earnings per share calculation | 51,465,000 | 51,678,000 | 52,628,000 | 53,217,000 | 54,196,000 | 54,905,000 | 55,712,000 | 57,418,000 | 52,244,000 | 55,540,000 | 57,963,000

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Warrant -URI http://asc.fasb.org/extlink&oid=6528364 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1757-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Treasury Stock Method -URI http://asc.fasb.org/extlink&oid=6527216 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Call Option -URI http://asc.fasb.org/extlink&oid=6506649 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -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 55 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2626-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 48 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2538-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingently Issuable Shares -URI http://asc.fasb.org/extlink&oid=6508586 + Details
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