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 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Net income          
Continuing operations $ 43,271 $ 35,611 $ 74,824 $ 62,899  
Income (loss) from discontinued operations, net of tax 9 (4,864) 0 (5,982)  
Net income $ 43,280 $ 30,747 $ 74,824 $ 56,917 $ 130,675
Weighted average number of shares outstanding:          
Basic 53,541 56,970 54,161 57,640  
Dilutive effect of stock-based compensation awards 1,187 1,480 1,339 1,611  
Diluted 54,728 58,450 55,500 59,251  
Net income (loss) per share - basic:          
Continuing operations (usd per share) $ 0.81 $ 0.63 $ 1.38 $ 1.09  
Discontinued operations (usd per share) $ 0.00 $ (0.09) $ 0.00 $ (0.10)  
Net income (usd per share) $ 0.81 $ 0.54 $ 1.38 $ 0.99  
Net income (loss) per share - diluted:          
Continuing operations (usd per share) $ 0.79 $ 0.61 $ 1.35 $ 1.06  
Discontinued operations (usd per share) $ 0.00 $ (0.08) $ 0.00 $ (0.10)  
Net income (usd per share) $ 0.79 $ 0.53 $ 1.35 $ 0.96  
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 350 751 432 845