QUARTERLY RESULTS OF OPERATIONS (Tables)

12 Months Ended

Dec. 31, 2019

Selected Quarterly Financial Information [Abstract]

The following is a summary of the unaudited quarterly results of operations for the years ended December 31, 2019 and 2018. Information about prior period acquisitions and the adoption of recent accounting pronouncements that may affect the comparability of the quarterly financial information presented below are included in Note 2 and Note 4.



	2019
	Mar. 31			Jun. 30			Sep. 30			Dec. 31
Revenues	$	328,425		$	343,760		$	352,808		$	374,726
Cost of revenues	71,153			71,918			71,172			74,996
Gross profit	257,272			271,842			281,636			299,730
Operating expenses	163,780			197,042			187,367			198,744
Income from operations	93,492			74,800			94,269			100,986
Interest and other income	4,945			5,913			5,358			13,801
Interest and other expense	(732		)	(697		)	(704		)	(482		)
Income before income taxes	97,705			80,016			98,923			114,305
Income tax expense	12,536			16,768			20,304			26,378
Net income	$	85,169		$	63,248		$	78,619		$	87,927
Net income per share — basic	$	2.35		$	1.74		$	2.16		$	2.42
Net income per share — diluted	$	2.33		$	1.73		$	2.15		$	2.39



	2018
	Mar. 31			Jun. 30			Sep. 30			Dec. 31
Revenues	$	273,718		$	297,018		$	305,525		$	315,571
Cost of revenues	62,477			67,136			72,072			68,248
Gross profit	211,241			229,882			233,453			247,323
Operating expenses	157,796			186,108			162,765			141,666
Income from operations	53,445			43,774			70,688			105,657
Interest and other income	2,987			2,652			3,035			4,607
Interest and other expense	(690		)	(728		)	(717		)	(695		)
Income before income taxes	55,742			45,698			73,006			109,569
Income tax expense	3,511			1,863			14,247			26,060
Net income	$	52,231		$	43,835		$	58,759		$	83,509
Net income per share — basic	$	1.46		$	1.22		$	1.63		$	2.31
Net income per share — diluted	$	1.44		$	1.20		$	1.61		$	2.29