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Net Income Per Share (Reconciliation between Basic and Diluted Weighted Average Shares Outstanding) (Details) (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Net Income Per Share        
Net income $ 37,035 $ 41,185 $ 83,328 $ 85,313
Net income attributable to unvested awarded performance stock (1,165) (1,295) (2,563) (2,688)
Net income attributable to common shares $ 35,870 $ 39,890 $ 80,765 $ 82,625
Weighted average basic number of common shares outstanding 142,873 142,154 142,756 142,133
Less unvested awarded performance stock included in weighted average basic shares outstanding (4,494) (4,469) (4,391) (4,479)
Weighted average number of common shares outstanding for basic earnings per common share 138,379 137,685 138,365 137,654
Dilutive effect of stock options 1,563 1,420 2,585 1,283
Weighted average number of shares outstanding 139,942 139,105 140,950 138,937
Basic $ 0.26 $ 0.29 $ 0.58 $ 0.60
Diluted $ 0.26 $ 0.29 $ 0.57 $ 0.59