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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Details of basic and diluted earnings per share
Net income	$ 15,629	$ 18,878
Weighted average common shares outstanding used in basic EPS	42,966	42,751
Common shares issuable upon exercise of dilutive stock options and PSAs/RSUs	955	716
Weighted average common shares outstanding and common share equivalents used in diluted EPS	43,921	43,467
Earnings per share
Basic	$ 0.36	$ 0.44
Diluted	$ 0.36	$ 0.43

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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