STOCK-BASED COMPENSATION, Equity Instruments Other Than Options (Details) - $ / shares	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Stock Units (RSUs) [Member]
Equity instruments other than options [Roll Forward]
Number of Shares, Unvested, January 1, 2016	164,674
Number of Shares, Granted	73,793
Number of Shares, Vested	(101,739)
Number of Shares, Forfeited	(5,609)
Number of Shares, Unvested, December 31, 2016	131,119	164,674
Equity instruments other than options, additional disclosures [Abstract]
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2016	$ 37.49
Weighted-Average Grant-Date Fair Value, Granted	53.85	$ 41.09	$ 37.95
Weighted-Average Grant-Date Fair Value, Vested	38.96
Weighted-Average Grant-Date Fair Value, Forfeited	40.34
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2016	$ 45.44	$ 37.49
Restricted Stock [Member]
Equity instruments other than options [Roll Forward]
Number of Shares, Unvested, January 1, 2016	787,324
Number of Shares, Granted	124,744
Number of Shares, Vested	(162,113)
Number of Shares, Forfeited	0
Number of Shares, Unvested, December 31, 2016	749,955	787,324
Equity instruments other than options, additional disclosures [Abstract]
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2016	$ 43.43
Weighted-Average Grant-Date Fair Value, Granted	65.37	$ 43.49	32.54
Weighted-Average Grant-Date Fair Value, Vested	45.48
Weighted-Average Grant-Date Fair Value, Forfeited	0
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2016	$ 46.64	$ 43.43
Performance Shares [Member]
Equity instruments other than options [Roll Forward]
Number of Shares, Unvested, January 1, 2016	68,724
Number of Shares, Granted	25,045	32,632
Number of Shares, Vested	0
Number of Shares, Forfeited	0
Number of Shares, Unvested, December 31, 2016	93,769	68,724
Equity instruments other than options, additional disclosures [Abstract]
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2016	$ 34.63
Weighted-Average Grant-Date Fair Value, Granted	58.46	$ 35.98	$ 38.67
Weighted-Average Grant-Date Fair Value, Vested	0
Weighted-Average Grant-Date Fair Value, Forfeited	0
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2016	$ 46.02	$ 34.63

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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://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=6415400&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=6415400&loc=d3e5070-113901

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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

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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

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- 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=6415400&loc=d3e5070-113901

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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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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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

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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://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

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