Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block]

The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):

	Three months ended June 30,				Six months ended June 30,
	2015		2014		2015		2014
Earnings:
Net income (numerator for basic and diluted calculations)	$	130,391	$	198,296	$	255,505	$	334,960
Shares:
Weighted average outstanding shares (denominator for basic calculation)	66,351		69,076		67,246		69,823
Equivalent shares from outstanding stock options	769		642		785		666
Denominator for diluted calculation	67,120		69,718		68,031		70,489
Earnings per share:
Basic	$	1.97	$	2.87	$	3.80	$	4.80
Diluted	$	1.94	$	2.84	$	3.76	$	4.75