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STOCK BASED AND DEFERRED COMPENSATION - Summary of Nonvested (Restricted) Shares and Units Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Nonvested Restricted Share Activity (time-based) [Member] |  |  |  |
Nonvested Restricted Share Activity (time-based and performance-based), Number of Shares [Roll Forward] |  |  |  |
Outstanding at beginning of year (in shares) |  | 834,620 | 923,290 | 982,652
Granted (in shares) |  | 225,593 | 385,328 | 315,247
Vested (Earned/Released) (in shares) |  | (234,842) | (347,555) | (288,709)
Forfeited (in shares) | [1] | (34,754) | (126,443) | (85,900)
Outstanding at end of year (in shares) |  | 790,617 | 834,620 | 923,290
Nonvested Restricted Share Activity (time-based and performance-based), Weighted Average Grant Date Fair Value [Roll Forward] |  |  |  |
Outstanding at beginning of year (in dollars per share) |  | $ 41.25 | $ 38.25 | $ 35.59
Granted (in dollars per share) |  | 72.51 | 44.46 | 46.07
Vested (Earned/Released) (in dollars per share) |  | 38.80 | 37.15 | 37.93
Forfeited (in dollars per share) | [1] | 46.31 | 40.45 | 37.53
Outstanding at end of year (in dollars per share) |  | $ 50.67 | $ 41.25 | $ 38.25
Nonvested Restricted Share Activity (performance- based) [Member] |  |  |  |
Nonvested Restricted Share Activity (time-based and performance-based), Number of Shares [Roll Forward] |  |  |  |
Outstanding at beginning of year (in shares) |  | 405,909 | 378,455 | 287,005
Granted (in shares) |  | 80,193 | 115,191 | 157,637
Vested (Earned/Released) (in shares) |  | (178,174) | (87,737) | (36,801)
Forfeited (in shares) | [1] | 0 | 0 | (29,386)
Outstanding at end of year (in shares) |  | 307,928 | 405,909 | 378,455
Nonvested Restricted Share Activity (time-based and performance-based), Weighted Average Grant Date Fair Value [Roll Forward] |  |  |  |
Outstanding at beginning of year (in dollars per share) |  | $ 40.20 | $ 38.77 | $ 35.80
Granted (in dollars per share) |  | 61.06 | 40.46 | 45.20
Vested (Earned/Released) (in dollars per share) |  | 34.10 | 34.39 | 41.17
Forfeited (in dollars per share) | [1] | 0 | 0 | 41.17
Outstanding at end of year (in dollars per share) |  | $ 49.16 | $ 40.20 | $ 38.77
Shares issued as a result of performance achievement (in shares) |  | 24,054 | 21,039 |
[1] | Forfeitures on time-based nonvested shares are a result of terminations of employment, while forfeitures on performance-based nonvested shares are a result of failing to attain certain goals as outlined in our executive officers' compensation agreements. (2)Performance-based shares granted for the year ended December 31, 2019 includes 21,039 shares that were issued as a result of the performance achievement exceeding the performance targets related to grants to our executive officers for the year ended December 31, 2016. These shares vested in March 2019. (3)Performance-based shares granted for the year ended December 31, 2020 includes 24,054 shares that were issued as a result of the performance achievement exceeding the performance targets related to grants to our executive officers for the year ended December 31, 2017. These shares vested in February 2020.

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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