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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Details of basic and diluted earnings (loss) per share                      
Net income                 $ 59,379 $ 42,694 $ 54,434
Weighted average common shares outstanding used in basic EPS                 42,851 45,228 45,922
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs                 821 566 452
Weighted average common shares outstanding and common share equivalents used in diluted EPS                 43,672 45,794 46,374
Earnings per share                      
Basic                 $ 1.39 $ 0.94 $ 1.19
Diluted $ 0.16 $ 0.46 $ 0.31 $ 0.43 $ 0.22 $ 0.28 $ 0.05 $ 0.38 $ 1.36 $ 0.93 $ 1.17