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STOCK PLANS (Textual) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 23, 2015
Stock Plans |  |  |  |
Common shares available for future grant under all plans (in shares) | 4,324,951 |  |  |
Total stock-based compensation expense | $ 12,698,000 | $ 10,332,000 | $ 7,932,000 |
Tax benefit related to stock-based compensation recognized in the period | 4,861,000 | 3,955,000 | 3,037,000 |
Total unrecognized stock-based compensation expense related to nonvested stock options, restricted shares and restricted stock units | $ 20,022,000 |  |  |
Weighted average period of recognition of unrecognized stock-based compensation expense (in months) | 1 year 10 months 25 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 3,040,000 | 2,865,000 | 3,273,000 |
Stock options |  |  |  |
Stock Plans |  |  |  |
Award expiration (in years) | 10 years |  |  |
Award vesting period (in years) | 3 years |  |  |
Aggregate intrinsic value of awards outstanding | $ 45,139,000 |  |  |
Aggregate intrinsic value of awards exercisable | 37,169,000 |  |  |
Total intrinsic value of awards exercised | $ 19,328,000 | $ 30,967,000 | $ 6,879,000 |
Restricted stock awards |  |  |  |
Stock Plans |  |  |  |
Shares converted (in shares) | 12,213 |  |  |
Shares granted | 13,910 |  |  |
Shares granted (in dollars per share) | $ 89.82 |  |  |
Remaining weighted average life of non-vested restricted awards (in years) | 1 year 2 months 12 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 47,856 | 46,159 |  |
Restricted Stock Units |  |  |  |
Stock Plans |  |  |  |
Shares converted (in shares) | 71,845 |  |  |
Shares granted | 145,245 |  |  |
Shares granted (in dollars per share) | $ 85.69 |  |  |
Remaining weighted average life of non-vested restricted awards (in years) | 1 year 10 months 25 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 418,966 | 376,784 |  |
Performance Shares [Member] |  |  |  |
Stock Plans |  |  |  |
Award vesting period (in years) | 3 years |  |  |
Shares granted | 34,660 |  |  |
Shares granted (in dollars per share) | $ 70.09 |  |  |
Remaining weighted average life of non-vested restricted awards (in years) | 1 year 7 months 6 days |  |  |
1995 Lincoln Stock Purchase Plan |  |  |  |
Stock Plans |  |  |  |
Maximum additional number of the Company's common shares that may be granted (in shares) | 800,000 |  |  |
Shares purchased (in shares) | 10,458 | 15,827 | 16,012 |
Equity and Incentive Compensation Plan [Member] |  |  |  |
Stock Plans |  |  |  |
Maximum additional number of the Company's common shares that may be granted (in shares) |  |  |  | 5,400,000
Equity and Incentive Compensation Plan [Member] | Restricted Stock Units |  |  |  |
Stock Plans |  |  |  |
Shares granted | 110,585 |  |  |
Equity and Incentive Compensation Plan [Member] | Performance Shares [Member] |  |  |  |
Stock Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 75,285 |  |  |
Director Plan |  |  |  |
Stock Plans |  |  |  |
Maximum additional number of the Company's common shares that may be granted (in shares) |  |  |  | 300,000
2005 Plan | Restricted Stock Units |  |  |  |
Stock Plans |  |  |  |
Shares converted (in shares) | 10,193 |  |  |
Deferred RSUs (in shares) | 96,180 |  |  |
Minimum | Restricted stock awards |  |  |  |
Stock Plans |  |  |  |
Award vesting period (in years) | 3 years |  |  |
Minimum | Restricted Stock Units |  |  |  |
Stock Plans |  |  |  |
Award vesting period (in years) | 3 years |  |  |
Maximum | Restricted stock awards |  |  |  |
Stock Plans |  |  |  |
Award vesting period (in years) | 5 years |  |  |
Maximum | Restricted Stock Units |  |  |  |
Stock Plans |  |  |  |
Award vesting period (in years) | 5 years |  |  |
Maximum | 1995 Lincoln Stock Purchase Plan |  |  |  |
Stock Plans |  |  |  |
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 |  |  |

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- Definition Represents the dollar value of shares that each employee has the ability to purchase annually on the open market on a commission-free basis under the plan. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 + 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 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 + 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 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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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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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