Principal Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2012

Accounting Policies [Abstract]

Calculation Of Diluted Earnings Per Share

(Dollars in thousands except per share data)	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Numerator:
Net income	$	25,304	$	29,128	$	92,750	$	65,472
Denominator:
Weighted-average common shares outstanding	55,906,636		55,535,074		55,806,937		55,331,170
Stock options and nonvested stock	556,899		582,260		625,279		722,889
	56,463,535		56,117,334		56,432,216		56,054,059
Diluted Earnings per Share:	$	0.45	$	0.52	$	1.64	$	1.17
Anti-dilutive securities excluded from the
computation of diluted EPS	1,818,992		2,070,672		1,779,609		1,838,289