Earnings Per Share and Capital Structure Earnings Per Share and Capital Structure (Tables)

6 Months Ended

Jun. 30, 2011

Earnings Per Share and Capital Structure [Abstract]

Computation of Basic and Diluted Earnings Per Share [Table Text Block]

The following table sets forth the computation of basic and diluted earnings per share (EPS):

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
	(in thousands, except per share data)
Net income available to common shareholders	$	34,436	$	25,311	$	61,556	$	50,561
Weighted average common shares outstanding - Basic	40,670		40,329		40,608		40,261
Dilutive effect of convertible notes	—		283		—		206
Dilutive effect of stock-based awards	407		549		451		544
Weighted average common shares outstanding - Diluted	41,077		41,161		41,059		41,011
Earnings per common share - Basic	$	0.85	$	0.63	$	1.52	$	1.26
Earnings per common share - Diluted	$	0.84	$	0.61	$	1.50	$	1.23