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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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) |  | 790,617 | 834,620 | 923,290
Granted (in shares) |  | 226,936 | 225,593 | 385,328
Vested (Earned/Released) (in shares) |  | (264,513) | (234,842) | (347,555)
Forfeited (in shares) | [1] | (60,511) | (34,754) | (126,443)
Outstanding at end of year (in shares) |  | 692,529 | 790,617 | 834,620
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) |  | $ 50.67 | $ 41.25 | $ 38.25
Granted (in dollars per share) |  | 85.19 | 72.51 | 44.46
Vested (Earned/Released) (in dollars per share) |  | 46.09 | 38.80 | 37.15
Forfeited (in dollars per share) | [1] | 60.96 | 46.31 | 40.45
Outstanding at end of year (in dollars per share) |  | $ 62.94 | $ 50.67 | $ 41.25
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) |  | 307,928 | 405,909 | 378,455
Granted (in shares) |  | 86,384 | 80,193 | 115,191
Vested (Earned/Released) (in shares) |  | (203,561) | (178,174) | (87,737)
Forfeited (in shares) | [1] | 0 | 0 | 0
Outstanding at end of year (in shares) |  | 190,751 | 307,928 | 405,909
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) |  | $ 49.16 | $ 40.20 | $ 38.77
Granted (in dollars per share) |  | 65.91 | 61.06 | 40.46
Vested (Earned/Released) (in dollars per share) |  | 44.92 | 34.10 | 34.39
Forfeited (in dollars per share) | [1] | 0 | 0 | 0
Outstanding at end of year (in dollars per share) |  | $ 61.68 | $ 49.16 | $ 40.20
Shares issued as a result of performance achievement (in shares) |  | 37,425 | 24,054 | 21,039
[1] | (1)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. (2)Forfeitures on time-based nonvested shares are a result of terminations of employment, while forfeitures on performance-based nonvested shares are the result of failing to attain certain goals as outlined in our executive officers' compensation agreements. (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. (4)Performance-based shares granted for the year ended December 31, 2021 includes 37,425 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, 2018. These shares vested in March 2021. Performance-based shares granted for the year ended December 31, 2021 also includes 1,670 shares and 696 shares that were issued to our General Counsel, who retired on December 15, 2021, as a result of the performance achievement exceeding the performance targets related to grants to our executive officers for the years ended December 31, 2019 and 2018, respectively. These shares vested in December 2021 in accordance with his employment agreement.

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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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