Selected Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Selected Quarterly Financial Data (unaudited) [Abstract]

Quarterly Financial Information

	Quarter
(in thousands, except per share amounts)	First		Second		Third		Fourth
2019
Revenue	$	165,876	$	187,103	$	190,061	$	170,632
Gross profit		125,147		140,710		142,933		128,068
Income from operations before income taxes		25,021		27,778		20,583		18,981
Net income		20,750		21,383		15,902		19,881
Basic earnings per share		1.75		1.80		1.36		1.71
Diluted earnings per share		1.70		1.75		1.32		1.66
2018
Revenue	$	98,596	$	117,324	$	139,239	$	145,844
Gross profit		74,808		88,799		107,201		109,091
Income from operations before income taxes		14,931		17,619		17,828		20,170
Net income		12,222		14,133		13,781		15,653
Basic earnings per share		1.02		1.17		1.15		1.32
Diluted earnings per share		1.01		1.16		1.14		1.30