Acquisitions Acquisitions (Pro Forma) (Details) - Pro Forma [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales	$ 2,890,163	$ 2,819,398
Net income	$ 15,098	$ 56,710
Basic net income per share	$ 0.23	$ 0.87
Diluted net income per share	$ 0.23	$ 0.86

Pro forma basic earnings per share or earnings per unit, which is commonly presented in initial public offerings based on the terms of the offering.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Pro forma diluted earnings per share, which is commonly presented in initial public offerings.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6784503&loc=d3e463720-122850

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01(b)(4))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

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-Topic 205
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-Section S99
-Paragraph 7
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-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5934-122674

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