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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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