Income per share data (Tables)

6 Months Ended

Jun. 30, 2012

Income per share data [Abstract]

Summary of reconciliation of the numerator and denominator of earnings per share computation

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
	(In thousands except per share data)
Net income	$	2,356	$	15,791	$	4,057	$	19,486
Weighted average basic common shares outstanding		27,550		26,670		27,392		26,189
Dilutive effect of stock-based awards		703		1,269		846		1,607
Weighted average diluted common shares outstanding		28,253		27,939		28,238		27,796
Earnings per share:
Basic	$	0.09	$	0.59	$	0.15	$	0.74
Diluted	$	0.08	$	0.57	$	0.14	$	0.70

Summary of weighted average effect of potentially dilutive securities

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Restricted stock units and awards		5		84		89		42
Early exercise shares		—		—		—		1
Stock options		512		35		450		18