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Long-Term Equity Compensation (Summary of Stock Options) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Oustanding beginning balance, Number of Options 3,313,356us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Granted, Number of Options 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Exercised, Number of Options (1,320,086)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised    
Forfeited or expired, Number of Options (41,059)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod    
Oustanding ending balance, Number of Options 1,952,211us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 3,313,356us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Outstanding beginning balance, Weighted Average Exercise Price $ 31.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice    
Granted, Weighted Average Exercise Price $ 0.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice    
Exercised, Weighted Average Exercise Price $ 28.52us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice    
Forfeited or expired, Weighted Average Exercise Price $ 42.01us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice    
Outstanding ending balance, Weighted Average Exercise Price $ 33.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 31.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Outstanding balance, Weighted Average Remaining Contractual Term (Years) 2 years 7 days    
Oustanding balance, Agregate Intrinsic Value $ 40,278,961us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue    
Vested or expected to vest, Number of Options 1,952,045us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber    
Vested or expected to vest, Weighted Average Exercise Price $ 33.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice    
Vested or expected to vest, Weighted Average Remaining Contractual Term (Years) 2 years 7 days    
Vested or expected to vest, Aggregate Intrinsic Value 40,275,247us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue    
Exercisable, Number of Options 1,944,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Exercisable, Weighted Average Exercise Price $ 33.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice    
Exercisable, Weighted Average Remaining Contractual Term (Years) 2 years 4 days    
Exercisable, Aggregate Intrinsic Value $ 40,109,115us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1