Note 1. Principal Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2014

Accounting Policies [Abstract]

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

	Three Months Ended June 30,				Six Months Ended June 30,
(Dollars in thousands, except per share data)	2014		2013		2014		2013
Numerator:
Net income	$	53,667	$	42,897	$	66,560	$	56,902
Denominator:
Weighted-average common shares outstanding	57,128,379		56,354,017		57,043,378		56,226,038
Stock options and nonvested stock	566,312		606,721		533,995		634,057
	57,694,691		56,960,738		57,577,373		56,860,095
Diluted Earnings per Share	$	0.93	$	0.75	$	1.16	$	1.00
Anti-dilutive stock options excluded from the computation of diluted EPS	499,469		1,119,661		719,958		1,119,661