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STOCK PLANS (Textual) (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Stock options | Dec. 31, 2011 Stock options | Dec. 31, 2010 Stock options | Dec. 31, 2012 Restricted stock awards | Dec. 31, 2011 Restricted stock awards | Dec. 31, 2010 Restricted stock awards | Dec. 31, 2012 Restricted Stock Units | Dec. 31, 2011 Restricted Stock Units | Dec. 31, 2012 1995 Lincoln Stock Purchase Plan | Dec. 31, 2011 1995 Lincoln Stock Purchase Plan | Dec. 31, 2010 1995 Lincoln Stock Purchase Plan | Apr. 28, 2006 EPI Plan | Dec. 31, 2010 EPI Plan Restricted stock awards | Dec. 31, 2012 EPI Plan Restricted Stock Units | Dec. 31, 2011 EPI Plan Restricted Stock Units | Apr. 28, 2006 Director Plan | Dec. 31, 2012 Director Plan Restricted stock awards | Dec. 31, 2011 Director Plan Restricted stock awards | Dec. 31, 2010 Director Plan Restricted stock awards | Dec. 31, 2012 2005 Plan Restricted Stock Units | Dec. 31, 2012 Minimum Restricted stock awards | Dec. 31, 2012 Minimum Restricted Stock Units | Dec. 31, 2012 Maximum Restricted stock awards | Dec. 31, 2012 Maximum Restricted Stock Units | Dec. 31, 2012 Maximum 1995 Lincoln Stock Purchase Plan
Stock Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum additional number of the Company's common shares that may be granted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  | 6,000,000 |  |  |  | 600,000 |  |  |  |  |  |  |  |  |
Common shares available for future grant under all plans (in shares) | 2,517,228 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award expiration (in years) |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years | 5 years | 5 years |
Aggregate intrinsic value of awards outstanding |  |  |  | $ 54,178,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of awards exercisable |  |  |  | 47,464,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of awards exercised |  |  |  | 18,776,000 | 10,028,000 | 4,270,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares converted (in shares) |  |  |  |  |  |  | 57,944 |  |  | 10,499 | 0 |  |  |  |  |  |  |  |  |  |  |  | 10,499 |  |  |  |  |
Deferred RSUs (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,713 |  |  |  |  |
Shares granted (in shares) |  |  |  |  |  |  | 20,099 | 22,779 | 112,864 | 133,944 | 166,519 |  |  |  |  | 82,992 | 133,944 | 166,519 |  | 20,099 | 22,779 | 29,872 |  |  |  |  |  |
Shares granted (in dollars per share) |  |  |  |  |  |  | $ 47.81 | $ 35.55 | $ 31.05 | $ 47.97 | $ 34.55 |  |  |  |  | $ 30.97 | $ 47.97 | $ 34.55 |  | $ 47.81 | $ 35.55 | $ 31.28 |  |  |  |  |  |
Remaining weighted average life of non-vested restricted awards (in years) |  |  |  |  |  |  | 1 year 9 months 18 days |  |  | 4 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | 8,961,000 | 6,610,000 | 8,213,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit related to stock-based compensation recognized in the period | 3,409,000 | 2,515,000 | 3,112,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized stock-based compensation expense related to nonvested stock options, restricted shares and restricted stock units | 23,718,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period of recognition of unrecognized stock-based compensation expense (in months) | 37 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dollar value of shares that each employee has the ability to purchase on the open market, on a commission-free basis annually under the plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000
Shares purchased (in shares) |  |  |  |  |  |  |  |  |  |  |  | 4,908 | 4,466 | 4,240 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -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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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -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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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(d) -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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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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