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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings:        
Net income (numerator for basic and diluted calculations) $ (49,612) $ 141,111 $ 135,923 $ 264,429
Shares:        
Weighted average outstanding shares (denominator for basic calculation) 72,350 73,718 73,089 73,646
Equivalent shares from outstanding stock options 0 336 484 402
Denominator for diluted calculation 72,350 74,054 73,573 74,048
Earnings Per Share:        
Basic earnings per share $ (0.69) $ 1.91 $ 1.86 $ 3.59
Diluted earnings per share $ (0.69) $ 1.91 $ 1.85 $ 3.57