Acquisitions - Unaudited Pro Forma Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Combinations [Abstract]
Net sales	$ 174,879	$ 137,235	$ 340,366	$ 266,935
Net income	$ 13,125	$ 10,813	$ 24,794	$ 19,982
Earnings per share:
Basic (in dollars per share)	$ 0.77	$ 0.64	$ 1.46	$ 1.19
Diluted (in dollars per share)	$ 0.76	$ 0.63	$ 1.44	$ 1.17
Business Acquisition, Pro Forma Information [Abstract]
Net sales		$ 173,834		$ 329,982
Net income		$ 13,537		$ 23,239
Earnings per share:
Basic (in dollars per share)		$ 0.80		$ 1.38
Diluted (in dollars per share)		$ 0.79		$ 1.36

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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