Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Data (Unaudited) [Abstract]

Quarterly Financial Data (Unaudited)

13.  Quarterly Financial Data (Unaudited)

	Quarter ended
	March 31		June 30		Sept. 30		Dec. 31
	(in thousands, except per share amounts)
2011:
Revenues	$	536,381	$	472,903	$	471,821	$	495,114
Gross profit		90,959		83,841		87,029		89,946	(1)
Operating income		15,129		11,400		14,094		16,691
Net income		8,786		6,741		4,099		10,844
Basic net income per share		0.33		0.25		0.16		0.42
Diluted net income per share		0.33		0.25		0.16		0.42
2010:
Revenues	$	457,662	$	412,418	$	414,146	$	435,526
Gross profit		72,685		71,357		73,686		80,808
Operating income		3,761		8,569		12,078		12,652
Net income		2,299		5,118		7,234		7,789
Basic net income per share		0.09		0.20		0.28		0.30
Diluted net income per share		0.09		0.20		0.28		0.30

(1)Included in the results for the fourth quarter of 2011 is a $2.5 million adjustment related to the reversal of Pennsylvania sales taxes accrued in prior periods. Please read Note 12 “Commitments and Contingencies” for additional information.