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Employee Compensation and Benefit Plans - Schedule of Equity-based Compensation Expense Related to Stock Options and Stock Awards and Related Excess Tax Benefit (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity-based compensation expense:      
Awards $ 10,729us-gaap_ShareBasedCompensation $ 5,648us-gaap_ShareBasedCompensation $ 2,934us-gaap_ShareBasedCompensation
Excess tax benefit related to share-based awards 6,374us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 21,244us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 11,031us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Stock Options [Member]      
Equity-based compensation expense:      
Awards 9,983us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
5,388us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
2,776us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Stock Distribution [Member]      
Equity-based compensation expense:      
Awards $ 746us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockDistributionMember
$ 260us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockDistributionMember
$ 158us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_StockDistributionMember