Acquisitions - Unaudited Pro Forma Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Business Combinations [Abstract]
Net sales	$ 165,487	$ 129,700
Net income	$ 11,669	$ 9,169
Earnings per share:
Basic (in dollars per share)	$ 0.69	$ 0.54
Diluted (in dollars per share)	$ 0.68	$ 0.54
Business Acquisition, Pro Forma Information [Abstract]
Net sales		$ 156,148
Net income		$ 9,703
Earnings per share:
Basic (in dollars per share)		$ 0.58
Diluted (in dollars per share)		$ 0.57

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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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.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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