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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
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity-based compensation expense:      
Awards $ 5,624 $ 5,181 $ 7,291
Excess tax benefit related to share-based awards 3,701 686 6,824
Stock Options [Member]      
Equity-based compensation expense:      
Awards 1,457 1,644 3,978
Stock Awards [Member]      
Equity-based compensation expense:      
Awards $ 4,167 $ 3,537 $ 3,313