	Quarter Ended
	March 31			June 30			September 30			December 31
	(in thousands, except per share amounts)
2016:
Total revenues	$	186,226		$	190,252		$	189,311		$	195,169
Total cost of revenues (exclusive of depreciation)		89,483			92,783			93,420			99,461
Operating income (1)		41,291			29,374			36,598			25,366
Income before income taxes (1)		33,094			17,285			30,159			19,461
Income tax provision (2)		(11,590	)		(6,448	)		(12,265	)		(6,814	)
Net income (1)(2)		21,504			10,837			17,894			12,647
Basic earnings per common share (1)(2)	$	0.70		$	0.35		$	0.58		$	0.41
Diluted earnings per common share (1)(2)		0.64			0.33			0.55			0.38

2015:
Total revenues	$	185,631		$	182,641		$	186,960		$	197,288
Total cost of revenues (exclusive of depreciation)		100,266			91,796			92,182			95,497
Operating income (3)		21,893			26,156			31,021			34,070
Income before income taxes (3)		16,711			22,446			27,943			29,241
Income tax provision (2)		(7,353	)		(9,652	)		(11,196	)		(5,573	)
Net income (2)(3)		9,358			12,794			16,747			23,668
Basic earnings per common share (2)(3)	$	0.30		$	0.42		$	0.54		$	0.76
Diluted earnings per common share (2)(3)		0.28			0.39			0.50			0.70

(1)

During the first, second, and fourth quarters of 2016 we incurred restructuring and reorganization charges of $(5.7) million, $5.3 million, and $1.0 million, respectively, or $(0.11), $0.10, and $0.02 per diluted share. The negative restructuring and reorganization charges in the first quarter reflect the gain on disposition of business operations (see Note 6).

(2)

Fluctuations in our effective income tax rate between quarters generally relates to the accounting for discrete income tax items in any given quarter, and revisions of estimates for certain income tax components during the year.

•For 2016: Our effective income tax rates for the first, second, third, and fourth quarters were 35%, 37%, 41%, and 35%, respectively.

•For 2015: Our effective income tax rates for the first, second, third, and fourth quarters were 44%, 43%, 40%, and 19%, respectively. The low fourth quarter rate can be mainly attributed to full year impact of the 2015 R&D tax credits, as the legislation was not passed until December 2015.

(3)	During the first, second, third, and fourth quarters of 2015 we incurred restructuring and reorganization charges of $0.6 million, $0.4 million, $0.8 million, and $1.3 million, respectively, or $0.01, $0.01, $0.02, and $0.03 per diluted share (see Note 6).