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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
Earnings Per Share    
Net income for basic and diluted earnings per share (in dollars) $ 76,226 $ 46,964
Weighted-average common shares outstanding 219,097 217,584
Dilutive effect of stock options, performance share awards and restricted stock awards (in shares) 1,387 1,646
Diluted weighted-average shares outstanding 220,484 219,230
Basic earnings per share (in dollars per share) $ 0.35 $ 0.22
Diluted earnings per share (in dollars per share) $ 0.35 $ 0.21