Note 1. Principal Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2015

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)	2015		2014		2015		2014
Numerator:
Net income	$	44,035	$	53,667	$	65,827	$	66,560
Denominator:
Weighted-average common shares outstanding - Basic	57,419,971		57,128,379		57,526,585		57,043,378
Stock options and nonvested stock	385,383		566,312		486,584		533,995
Weighted-average common shares outstanding - Diluted	57,805,354		57,694,691		58,013,169		57,577,373
Diluted EPS	$	0.76	$	0.93	$	1.13	$	1.16
Anti-dilutive stock options excluded from the calculation of diluted EPS	408,097		499,469		347,574		719,958