Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Earnings per share

The following table sets forth the calculations of basic and diluted net income per share (dollars in thousands, except share data):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Basic net income per share:
Net income	$	31,732	$	48,074	$	96,842	$	162,845
Weighted average number of common shares outstanding	47,948,562		47,643,648		47,442,208		48,107,159
Basic net income per share	$	0.66	$	1.01	$	2.04	$	3.39
Diluted net income per share:
Net income	$	31,732	$	48,074	$	96,842	$	162,845
Weighted average number of common shares outstanding	47,948,562		47,643,648		47,442,208		48,107,159
Dilutive effect of stock options and non-vested stock awards	1,498,680		1,400,337		1,401,894		1,668,364
Dilutive effect of assumed conversion of the 2.0% Convertible Senior Notes	—		1,209,772		1,259,906		1,629,832
Dilutive effect of warrants	1,948,229		—		1,514,860		445,623
Weighted average number of common shares and dilutive potential common shares outstanding	51,395,471		50,253,757		51,618,868		51,850,978
Diluted net income per share	$	0.62	$	0.96	$	1.88	$	3.14