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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
9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity-based compensation expense:          
Awards $ 5,130 $ 9,372 $ 10,729 $ 5,648 $ 2,934
Excess tax benefit related to share-based awards     6,374 21,244 11,031
Stock Options [Member]          
Equity-based compensation expense:          
Awards     9,983 5,388 2,776
Stock Distribution [Member]          
Equity-based compensation expense:          
Awards     $ 746 $ 260 $ 158