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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 580,908	$ 553,073	$ 1,740,135	$ 1,657,082
Cost of sales	503,173	487,911	1,506,060	1,442,487
Gross profit	77,735	65,162	234,075	214,595
General and administrative expenses	25,353	23,033	82,002	73,920
Selling expenses	8,998	8,690	25,715	25,591
Amortization of intangible assets	5,115	4,937	15,353	14,818
Acquisition expenses	0	0	0	68
Impairment	0	11,989	0	11,989
Income from operations	38,269	16,513	111,005	88,209
Other income (expense):
Interest expense	(6,713)	(7,044)	(20,823)	(21,649)
Other, net	1,333	533	2,245	12,486
Other expense, net	(5,380)	(6,511)	(18,578)	(9,163)
Income before income tax	32,889	10,002	92,427	79,046
Income tax expense	7,429	5,338	21,227	21,209
Net income	$ 25,460	$ 4,664	$ 71,200	$ 57,837
Net income per share:
Basic (in usd per share)	$ 0.47	$ 0.08	$ 1.30	$ 1.01
Diluted (in usd per share)	$ 0.46	$ 0.08	$ 1.28	$ 0.98
Weighted average common shares outstanding (in thousands):
Basic (in shares)	54,413	56,798	54,975	57,486
Diluted (in shares)	55,019	57,742	55,502	59,218
Dividends declared per share (in usd per share)	$ 0.08	$ 0.075	$ 0.24	$ 0.225

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1505-109256

+ Details

Name:	us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration