Supplemental Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Supplemental Selected Quarterly Financial Data [Abstract]

Summary of supplemental selected quarterly financial data

	Quarter Ended
	First Quarter		Second Quarter		Third Quarter			Fourth Quarter
	(In thousands, except per share amounts)
Fiscal Year 2011
Revenues	$	202,651	$	230,822	$	261,193		$	263,514
Operating income		27,948		31,596		39,179			34,041
Net income		15,854		19,280		22,997			21,886
Net income per share:
Basic		0.18		0.21		0.25			0.24
Diluted		0.16		0.19		0.23			0.22
Fiscal Year 2010
Revenues	$	160,798	$	181,352	$	179,278		$	194,526
Operating income		13,709		19,896		19,532	(1)		24,867
Net income		7,782		10,840		8,234			14,770
Net income per share:
Basic		0.09		0.12		0.09			0.16
Diluted		0.09		0.12		0.09			0.15