Earnings Per Share (Tables)

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Basic net income per share:
Net income	$	32,024	$	44,294	$	65,110	$	114,771
Weighted average number of common shares outstanding	47,312,154		48,419,556		47,186,248		48,342,756
Basic net income per share	$	0.68	$	0.91	$	1.38	$	2.37
Diluted net income per share:
Net income	$	32,024	$	44,294	$	65,110	$	114,771
Weighted average number of common shares outstanding	47,312,154		48,419,556		47,186,248		48,342,756
Dilutive effect of stock options and non-vested stock awards	1,245,492		1,764,664		1,329,421		1,813,532
Dilutive effect of assumed conversion of the 2.0% Convertible Senior Notes	967,141		2,196,048		1,578,640		1,818,377
Dilutive effect of warrants	914,700		1,161,100		1,076,618		683,638
Weighted average number of common shares and dilutive potential common shares outstanding	50,439,487		53,541,368		51,170,927		52,658,303
Diluted net income per share	$	0.63	$	0.83	$	1.27	$	2.18