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Stock-Based Compensation (Restricted Stock Units Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)
6 Months Ended
Jun. 30, 2012
Restricted Stock Units (RSUs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
RSUs outstanding, Beginning Balance, Unvested 741,043
RSUs outstanding, Beginning Balance, Vested but Deferred 20,076
RSUs outstanding, Beginning Balance, Total 761,119
RSUs outstanding, Beginning Balance, Weighted Average Grant Date Valueper RSU $ 50.66
Granted, Unvested 293,609
Granted, Total 293,609
Granted, Weighted Average Grant Date Valueper RSU $ 55.40
Dividend equivalents, Unvested 2,553
Dividend equivalents, Vestedd but Deferred (3)
Dividend equivalents, Total 2,550
Dividend equivalents, Weighted Average Grant Date Valueper RSU $ 50.69
Vested, Unvested (245,251)
Vested, Total (245,251)
Vested, Weighted Average Grant Date Valueper RSU $ 50.74
Vested but deferred, Unvested 1,424
Vested but deferred, Vested but Deferred (1,424)
Vested but deferred, Total 0
Issued, Vested but Deferred 0
Issued, Total 0
Issued, Weighted Average Grant Date Valueper RSU $ 0.00
Forfeited, Unvested (44,928)
Forfeited, Total (44,928)
Forfeited, Weighted Average Grant Date Valueper RSU $ 48.43
RSUs outstanding, Ending Balance, Unvested 748,450
RSUs outstanding, Ending Balance, Vested but Deferred 18,649
RSUs outstanding, Ending Balance, Total 767,099
RSUs outstanding, Ending Balance, Weighted Average Grant Date Valueper RSU $ 52.59