Stockholders' Equity and EPS (Tables)

3 Months Ended

Mar. 31, 2013

Equity and Earnings Per Share [Abstract]

Reconciliation of Basic EPS to Diluted EPS

The following is a reconciliation of basic EPS to diluted EPS for the three months ended March 31, 2013 and 2012:

	Three months ended March 31,
(Dollars and shares in thousands, except per share amounts)	2013		2012
Numerator:
Net income available to common stockholders	$	40,891	$	34,790
Denominator:
Weighted average common shares outstanding-basic	44,802		43,780
Weighted average effect of dilutive securities:
Stock options and ESPP	402		501
Restricted stock units	189		179
Denominator for diluted calculation	45,393		44,460
Earnings per common share:
Basic	$	0.91	$	0.79
Diluted	$	0.90	$	0.78

Common Shares Excluded from Diluted EPS Calculation as They Were Deemed to be Anti-Dilutive

The following table summarizes the weighted-average common shares excluded from the diluted EPS calculation as they were deemed to be antidilutive for the three months ended March 31, 2013 and 2012:

	Three months ended March 31,
(Shares in thousands)	2013	2012
Stock options	708	121
Restricted stock units	—	1
Total	708	122