Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Quarterly Financial Data

	Quarter Ended
	March 31			June 30			September 30			December 31
2016
Revenues	$	470,285		$	460,147		$	438,042		$	441,920
Operating expenses
Direct cost of revenues		305,636			303,194			293,702			308,239
Selling, general and administrative expenses		103,609			108,245			106,220			116,478
Special charges		5,061			1,750			—			3,634
Acquisition-related contingent consideration		1,134			206			201			623
Amortization of other intangible assets		2,606			2,590			2,845			2,265
		418,046			415,985			402,968			431,239
Operating income		52,239			44,162			35,074			10,681
Interest income and other		2,557			4,125			3,213			571
Interest expense		(6,229	)		(6,303	)		(6,304	)		(5,983	)
Income before income tax provision		48,567			41,984			31,983			5,269
Income tax provision		18,386			15,437			10,292			(1,832	)
Net income	$	30,181		$	26,547		$	21,691		$	7,101
Earnings per common share — basic	$	0.75		$	0.65		$	0.53		$	0.17
Earnings per common share — diluted	$	0.73		$	0.64		$	0.52		$	0.17
Weighted average common shares outstanding
Basic		40,506			40,820			41,239			41,201
Diluted		41,148			41,599			42,065			42,018

	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