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Stock Options, Restricted Stock and Restricted Stock Units (Details 2) (Employee Stock [Member], USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercisable, Number of shares       100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Exercisable, Weighted-average exercise price $ 51.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
$ 51.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
$ 107.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember