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Incentive Plans (Schedule of Share-Based Plan Amounts Recognized) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Compensation charged against income before income tax benefit $ 9,015 $ 10,435 $ 9,391
Related income tax benefit recognized in income $ 3,155 $ 3,652 $ 3,287