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Stock-Based Incentive Plan (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation, Stock Options, Activity

Stock-based incentive plans compensation expense (in thousands):

		Three Months Ended June 30,								Six Months Ended June 30,
		2018				2017				2018				2017
Service-based stock appreciation rights ("SARs")		$	2,675			$	1,731			$	4,023			$	3,331
Service-based restricted stock units ("RSUs")		2,634				2,114				4,790				4,318
Market performance-based restricted stock units		959				170				1,305				174
Operating performance-based restricted stock units		1,185				371				2,032				407
Total stock-based compensation expense		$	7,453			$	4,386			$	12,150			$	8,230

Stock-based compensation agreements issued during the six months ended June 30, 2018, representing potential shares and their weighted average grant date fair values by type follows (shares in thousands, fair value in dollars):

		Six Months Ended June 30, 2018
		Shares			Weighted Average Grant Date Fair Value
Service-based SARs		634			$	27.87
Service-based RSUs		227			$	91.91
Market performance-based RSUs		41			$	99.97
Operating performance-based RSUs		41			$	88.38

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- References

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- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ 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 (d)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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