Quarterly Financial Data (unaudited)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

19. Quarterly Financial Data (unaudited)

	Quarter Ended
	March 31			June 30			September 30			December 31
2015
Revenues	$	432,338		$	449,137		$	455,470		$	442,204
Operating expenses
Direct cost of revenues		279,030			291,469			301,609			299,336
Selling, general and administrative expenses		102,214			109,045			105,058			116,351
Acquisition-related contingent consideration		234			(1,538	)		159			(55	)
Amortization of other intangible assets		3,012			3,007			2,900			2,807
		384,490			401,983			409,726			418,439
Operating income		47,848			47,154			45,744			23,765
Interest income and other		(137	)		950			2,027			392
Interest expense		(12,368	)		(12,473	)		(11,696	)		(6,231	)
Loss on early extinguishment of debt		—			—			(19,589	)		—
Income before income tax provision		35,343			35,631			16,486			17,926
Income tax provision		11,657			13,922			6,177			7,577
Net income	$	23,686		$	21,709		$	10,309		$	10,349
Earnings per common share — basic	$	0.59		$	0.53		$	0.25		$	0.25
Earnings per common share — diluted	$	0.57		$	0.52		$	0.25		$	0.25
Weighted average common shares outstanding
Basic		40,384			40,792			41,094			41,078
Diluted		41,324			41,696			41,982			41,879

	Quarter Ended
	March 31			June 30			September 30			December 31
2014
Revenues	$	425,552		$	454,324		$	451,178		$	425,158
Operating expenses
Direct cost of revenues		274,275			295,549			293,244			281,689
Selling, general and administrative expenses		108,387			107,032			102,461			115,965
Special charges		—			9,364			5,347			1,628
Acquisition-related contingent consideration		(1,843	)		(5	)		257			(85	)
Amortization of other intangible assets		4,616			3,452			3,398			4,055
		385,435			415,392			404,707			403,252
Operating income		40,117			38,932			46,471			21,906
Interest income and other		1,003			1,448			1,014			1,205
Interest expense		(12,655	)		(12,908	)		(12,634	)		(12,488	)
Income before income tax provision		28,465			27,472			34,851			10,623
Income tax provision		10,348			10,225			12,329			9,702
Net income	$	18,117		$	17,247		$	22,522		$	921
Earnings per common share — basic	$	0.46		$	0.43		$	0.57		$	0.02
Earnings per common share — diluted	$	0.45		$	0.42		$	0.55		$	0.02
Weighted average common shares outstanding
Basic		39,438			39,681			39,789			39,991
Diluted		40,457			40,750			40,819			41,090

The sum of the quarterly earnings per share amounts may not equal the annual amounts due to changes in the weighted-average number of common share outstanding during each quarterly period.