Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2011

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

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



	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Numerator:
Net income	$	34,073		$	23,975		$	42,867		$	45,644
Denominator:
Weighted average common shares and denominator for basic calculation:
Weighted average common shares outstanding	83,513			86,041			83,914			87,174
Less: Unvested restricted stock	(129		)	(332		)	(155		)	(433		)
Denominator for basic calculation	83,384			85,709			83,759			86,741
Weighted average effects of dilutive equity-based compensation awards:
Employee stock options and stock appreciation rights	56			685			94			996
Restricted stock awards	1,125			1,188			1,001			1,235
Denominator for diluted calculation	84,565			87,582			84,854			88,972
Net income per share—basic	$	0.41		$	0.28		$	0.51		$	0.53
Net income per share—diluted	$	0.40		$	0.27		$	0.51		$	0.51

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table sets forth (in thousands) the weighted average number of options to purchase shares of common stock, stock appreciation rights, restricted stock awards and equity awards subject to performance or market conditions which were not included in the calculation of diluted per share amounts because the effects would be anti-dilutive:



	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2011	2010	2011	2010
Options to purchase shares of common stock and restricted stock awards	2,468	216	2,445	83
Stock appreciation rights	5,033	1,828	4,909	1,671
Total	7,501	2,044	7,354	1,754

Schedule of Contingently Issuable Equity Awards Excluded From Computation of Earnings Per Share [Table Text Block]

The following table sets forth (in thousands) the number of equity awards that are contingently issuable which were not included in the calculation of diluted shares as the required market and/or performance conditions had not been met as of June 30, 2011 nor 2010:



	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2011	2010	2011	2010
Options to purchase shares of common stock and restricted stock awards	890	708	890	708
Stock appreciation rights	800	800	800	800
Total	1,690	1,508	1,690	1,508