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Per Share Data (Weighted Average Number of Common Shares Used In the Computation of Basic and Diluted Earnings per Share) (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Basic (shares) 123,781 127,668 124,869 128,765
Diluted (shares) 129,988 133,304 131,228 134,323