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Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares granted | shares 423
Weighted-average grant date fair value | $ / shares $ 115.19
Granted, Weighted-Average Exercise Price | $ / shares $ 461.19
Stock option exercises (shares) | shares 19
SOSARs forfeited | shares 20
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 | $ / shares $ 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%