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Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Weighted Average Diluted Shares Outstanding

The effects of potential common stock were determined using the treasury stock method (in thousands):

	Years ended December 31,
	2017			2016			2015
Basic weighted-average shares outstanding	102,168			101,291			100,616
Effect of potential common stock:
Common stock awards	1,354			1,126			887
Senior subordinated convertible notes	—			47			94
Diluted weighted-average shares outstanding	103,522			102,464			101,597

Property, Plant and Equipment Table

Depreciation and amortization are provided for using principally the straight-line method over the estimated useful lives of the assets as follows:

Buildings	20-30 years
Machinery	8-12 years
Other equipment	3-5 years

The components of property, plant and equipment at December 31 were as follows (in thousands):

	2017				2016
Land	$	2,471			$	2,404
Buildings	90,683				88,201
Machinery and other equipment	226,320				221,325
Computer equipment	77,508				70,110
Software	62,387				54,451
	459,369				436,491
Accumulated depreciation	(316,834		)		(295,173		)
	$	142,535			$	141,318

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- References

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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