Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2014

Basis of Presentation

Reconciliation of basic earnings per common share to diluted earnings per share

	Three Months Ended March 31,
(in thousands, except per share amounts)	2014		2013
Net income available to common stockholders	$	12,087	$	4,795
Basic weighted-average shares outstanding	48,899		48,536
Dilutive effect of potential common stock equivalents — stock options	166		90
Diluted weighted-average shares outstanding	49,065		48,626
Earnings per common share:
Basic	$	0.25	$	0.10
Diluted	0.25		0.10
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive	—		—

Schedule of stock option and restricted stock unit activity of the entity

	Three Months Ended March 31,
(in thousands)	2014			2013
Stock-based compensation expense recognized in operating expenses	$	2,476		$	2,879
Tax benefit of stock-based compensation expense in provision for income taxes	910			1,048
Stock-based compensation expense, net of tax	$	1,566		$	1,831
Fair value of shares vested	$	2,379		$	2,813
Proceeds to the Company from the exercise of stock-based compensation	$	1,769		$	496
Tax effect from exercise of stock-based compensation, including shortfall tax benefits	$	(135	)	$	(1,843	)

	At March 31,
(in thousands)	2014		2013
Stock-based compensation cost capitalized in inventory	$	459	$	361

Summary of financial instruments

	At March 31,				At December 31
(in thousands)	2014		2013		2013
Financial instruments	$	99,235	$	59,074	$	117,571

Schedule of effective tax rates and income tax expense

	Three Months Ended March 31,
(in thousands, except percentages)	2014			2013
Effective tax rate	38.6		%	47.0		%
Provision for income taxes	$	7,604		$	4,256