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SHARE-BASED PAYMENTS SHARE-BASED PAYMENTS (Tables)

12 Months Ended

Dec. 31, 2019

Restricted Stock Units Activity

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Activity

The following tables set forth activity and various statistics for our restricted stock unit awards:

		Number of Units			Weighted Average Price
Nonvested December 31, 2018		1,025,193			$	34.68
Granted		262,399			$	58.07
Released to participants		(541,871	)		$	19.73
Forfeited		(46,731	)		$	49.61
Nonvested December 31, 2019		698,990			$	54.05

		2019				2018				2017
Weighted-average grant date fair value (per share)		$	58.07			$	46.94			$	45.11
Fair value of units granted (thousands of dollars)		$	15,238			$	13,907			$	12,685
Grant date fair value of units vested (thousands of dollars)		$	10,691			$	9,552			$	7,258

Performance-Unit Activity

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Activity

The following tables set forth activity and various statistics related to the performance unit awards and the assumptions used in the valuations at the respective grant dates:

		Number of Units			Weighted Average Price
Nonvested December 31, 2018		1,243,643			$	44.08
Granted		338,427			$	68.02
Released to participants		(636,628	)		$	23.59
Forfeited		(7,621	)		$	39.54
Nonvested December 31, 2019		937,821			$	66.67

		2019		2018		2017
Volatility (a)		27.10%		39.20%		40.59%
Dividend yield		5.05%		5.49%		4.68%
Risk-free interest rate		2.47%		2.44%		1.49%

(a) - Volatility was based on historical volatility over three years using daily stock price observations.

		2019				2018				2017
Weighted-average grant date fair value (per share)		$	68.02			$	59.57			$	56.65
Fair value of units granted (thousands of dollars)		$	23,020			$	22,081			$	17,621
Grant date fair value of units vested (thousands of dollars)		$	15,018			$	12,545			$	8,704

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- Definition

Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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