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STOCK INCENTIVE PLANS - Stock Options Outstanding and Exercisable (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options outstanding, number (in shares) | 1,933,713 | 2,124,036 | 2,226,286 | 2,582,804
Options outstanding, weighted-average remaining contractual life (in years) | 5 years 11 months 8 days |  |  |
Options outstanding, weighted-average exercise price (in dollars per share) | $ 207.10 |  |  |
Options outstanding intrinsic value | $ 56,374 |  |  |
Options exercisable (in shares) | 1,375,844 |  |  |
Options exercisable, weighted-average remaining contractual life (in years) | 4 years 11 months 23 days |  |  |
Options exercisable, weighted-average exercise price (in dollars per share) | $ 196.83 |  |  |
Options exercisable intrinsic value | $ 54,242 |  |  |
Range 1 of Exercise Prices [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise price range, lower range limit (in dollars per share) | $ 72.14 |  |  |
Exercise price range, upper range limit (in dollars per share) | $ 85.82 |  |  |
Options outstanding, number (in shares) | 84,831 |  |  |
Options outstanding, weighted-average remaining contractual life (in years) | 10 months 13 days |  |  |
Options outstanding, weighted-average exercise price (in dollars per share) | $ 80.11 |  |  |
Options outstanding intrinsic value | $ 13,246 |  |  |
Options exercisable (in shares) | 84,831 |  |  |
Options exercisable, weighted-average remaining contractual life (in years) | 10 months 13 days |  |  |
Options exercisable, weighted-average exercise price (in dollars per share) | $ 80.11 |  |  |
Options exercisable intrinsic value | $ 13,246 |  |  |
Range 2 of Exercise Prices [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise price range, lower range limit (in dollars per share) | $ 102.26 |  |  |
Exercise price range, upper range limit (in dollars per share) | $ 196.31 |  |  |
Options outstanding, number (in shares) | 363,820 |  |  |
Options outstanding, weighted-average remaining contractual life (in years) | 2 years 11 months 16 days |  |  |
Options outstanding, weighted-average exercise price (in dollars per share) | $ 133.79 |  |  |
Options outstanding intrinsic value | $ 37,275 |  |  |
Options exercisable (in shares) | 362,677 |  |  |
Options exercisable, weighted-average remaining contractual life (in years) | 2 years 11 months 8 days |  |  |
Options exercisable, weighted-average exercise price (in dollars per share) | $ 133.68 |  |  |
Options exercisable intrinsic value | $ 37,199 |  |  |
Range 3 of Exercise Prices [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise price range, lower range limit (in dollars per share) | $ 204.01 |  |  |
Exercise price range, upper range limit (in dollars per share) | $ 262.14 |  |  |
Options outstanding, number (in shares) | 1,485,062 |  |  |
Options outstanding, weighted-average remaining contractual life (in years) | 6 years 11 months 16 days |  |  |
Options outstanding, weighted-average exercise price (in dollars per share) | $ 232.31 |  |  |
Options outstanding intrinsic value | $ 5,853 |  |  |
Options exercisable (in shares) | 928,336 |  |  |
Options exercisable, weighted-average remaining contractual life (in years) | 6 years 1 month 28 days |  |  |
Options exercisable, weighted-average exercise price (in dollars per share) | $ 232.16 |  |  |
Options exercisable intrinsic value | $ 3,797 |  |  |

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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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and 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 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of exercisable stock 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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