Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Basic And Diluted Earnings Per Share) (Details)

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Earnings Per Share (Basic And Diluted Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Net income          
Continuing operations $ 42,052 $ 17,558 $ 116,876 $ 80,457  
Income (loss) from discontinued operations, net of tax 0 128 0 (5,854)  
Net income $ 42,052 $ 17,686 $ 116,876 $ 74,603 $ 130,675
Weighted average number of shares outstanding:          
Basic 53,234 55,476 53,849 56,913  
Dilutive effect of stock-based compensation awards 1,145 1,609 1,274 1,611  
Diluted 54,379 57,085 55,123 58,524  
Net income (loss) per share - basic:          
Continuing operations (usd per share) $ 0.79 $ 0.32 $ 2.17 $ 1.41  
Discontinued operations (usd per share) $ 0.00 $ 0.00 $ 0.00 $ (0.10)  
Net income (usd per share) $ 0.79 $ 0.32 $ 2.17 $ 1.31  
Net income (loss) per share - diluted:          
Continuing operations (usd per share) $ 0.77 $ 0.31 $ 2.12 $ 1.37  
Discontinued operations (usd per share) $ 0.00 $ 0.00 $ 0.00 $ (0.10)  
Net income (usd per share) $ 0.77 $ 0.31 $ 2.12 $ 1.27  
Unexercised employee stock options and stock appreciation rights and unvested restricted stock units excluded from the diluted EPS calculation because their effect would have been antidilutive 431 731 432 807