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Long-Term Equity Compensation (Summary of Restricted Stock Units and Performance Stock Units) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Outstanding beginning balance, Number of Restricted Stock Units and Performance Share Units 1,937,670
Granted, Number of Restricted Stock Units and Performance Share Units 1,143,881
Vested, Number of Restricted Stock Units and Performance Share Units (678,854)
Forfeited, Number of Restricted Stock Units and Performance Share Units (563,925)
Outstanding ending balance, Number of Restricted Stock Units and Performance Share Units 1,838,772
Outstanding beginning balance, Weighted Average Grant-Date Fair Value $ 33.13
Granted, Weighted Average Grant-Date Fair Value $ 27.38
Vested,Weighted Average Grant-Date Fair Value $ 29.43
Forfeited, Weighted Average Grant-Date Fair Value $ 37.58
Outstanding ending balance, Weighted Average Grant-Date Fair Value $ 29.54
Outstanding beginning balance, Weighted Average Purchase Price $ 0.001
Granted, Weighted Average Purchase Price $ 0.001
Vested, Weighted Average Purchase Price $ 0.001
Forfeited, Weighted Average Purchase Price $ 0.001
Outstanding ending balance, Weighted Average Purchase Price $ 0.001
Outstanding, Weighted Average Remaining Contractual Term (Years) 1 year 7 months 24 days
Outstanding, Aggregated Intrinsic Value $ 54,554,846
Expected to vest, Number of Restricted Stock Units and Performance Share Units 1,642,366
Expected to vest, Weighted Average Grant-Date Fair Value $ 29.53
Expected to vest, Weighted Average Purchase Price $ 0.001
Expected to vest, Weighted Average Remaining Contractual Term (Years) 1 year 8 months 5 days
Expected to vest, Aggregate Intrinsic Value $ 48,727,404