Earnings per share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

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

The weighted-average number of shares of common stock and common stock equivalents used in the computation of basic and diluted earnings per share consisted of the following:

		Three Months Ended
		March 31,
		2013	2012
	(Amounts in Thousands)
Weighted-average number of shares outstanding - basic earnings per share		32,970	32,858
Dilutive effect of stock options and restricted stock units		2,057	1,367
Weighted-average number of shares outstanding - diluted earnings per share		35,027	34,225