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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2016
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted   460
Weighted-average grant date fair value   $ 117.48
Granted, Weighted-Average Exercise Price   $ 457.77
Stock option exercises (shares)   118
SOSARs forfeited   77
Change in estimate expense non-vested stock awards $ (6,031)  
Change in estimate expense non-vested stock awards, net of tax $ (3,687)  
Change in accounting estimate non vested stock awards earnings (loss) per share $ 0.12  
Stock Options And SOSARs [Member] | First Half Vested [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period for SOSARs   2 years
Stock Options And SOSARs [Member] | Second Half Vested [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period for SOSARs   3 years
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%  
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 400.00%