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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, January 1, 2017	131,119
Number of Shares, Granted	69,497
Number of Shares, Vested	(84,407)
Number of Shares, Forfeited	(5,526)
Number of Shares, Unvested, December 31, 2017	110,683	131,119
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2017	$ 45.44
Weighted-Average Grant-Date Fair Value, Granted	116.58	$ 53.85	$ 41.09
Weighted-Average Grant-Date Fair Value, Vested	46.38
Weighted-Average Grant-Date Fair Value, Forfeited	54.99
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2017	$ 88.91	$ 45.44
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, January 1, 2017	749,955
Number of Shares, Granted	3,604
Number of Shares, Vested	(173,022)
Number of Shares, Forfeited	(600)
Number of Shares, Unvested, December 31, 2017	579,937	749,955
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2017	$ 46.64
Weighted-Average Grant-Date Fair Value, Granted	83.25	$ 65.37	43.49
Weighted-Average Grant-Date Fair Value, Vested	47.14
Weighted-Average Grant-Date Fair Value, Forfeited	49.70
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2017	$ 46.72	$ 46.64
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, January 1, 2017	93,769
Number of Shares, Granted	24,664	25,045
Number of Shares, Vested	(45,118)
Number of Shares, Forfeited	0
Number of Shares, Unvested, December 31, 2017	73,315	93,769
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2017	$ 46.02
Weighted-Average Grant-Date Fair Value, Granted	105.65	$ 58.46	$ 35.98
Weighted-Average Grant-Date Fair Value, Vested	39.72
Weighted-Average Grant-Date Fair Value, Forfeited	0
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2017	$ 62.36	$ 46.02

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Per share weighted average intrinsic value of equity-based compensation awards forfeited. Excludes stock and unit 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
-Subparagraph (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- 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=96867065&loc=d3e5070-113901

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X

- 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=96867065&loc=d3e5070-113901

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X

- Definition

Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit 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
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- 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=96867065&loc=d3e5070-113901

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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=96867065&loc=d3e5070-113901

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X

- 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://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=96867065&loc=d3e5070-113901

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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.

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