Employee Benefit and Stock Plans (Details 3) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense related to stock option grants		$ 17,143	$ 8,382	$ 9,722
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		76,164	36,665	118,208
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense related to stock option grants	[1]	$ 7,576	$ 3,024	$ 2,285
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense related to stock option grants		$ 2,499	$ 1,750	$ 1,365
Restricted stock transactions
Outstanding at beginning of year, Shares		355,294	219,628	229,724
Weighted average per share grant date fair value in dollars per share		$ 15.88	$ 15.81	$ 16.23	$ 15.81
Granted, Shares		285,006	219,835	88,000
Granted, Weighted Average per Share Grant Date Fair Value		$ 15.19	$ 15.34	$ 17.50
Vested, Shares		(204,663)	(73,908)	(91,312)
Vested, Weighted Average per Share Grant Date Fair Value		$ 14.83	$ 16.52	$ 15.18
Cancelled, Shares		(18,660)	(10,261)	(6,784)
Cancelled, Weighted Average per Share Grant Date Fair Value		$ 15.45	$ 18.55	$ 17.24
Outstanding at end of year, Shares		416,977	355,294	219,628
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense related to stock option grants		$ 5,404	$ 3,699	$ 2,049
Restricted stock transactions
Outstanding at beginning of year, Shares		628,209	385,049	227,049
Weighted average per share grant date fair value in dollars per share		$ 15.52	$ 15.70	$ 16.39	$ 16.23
Granted, Shares		192,000	243,160	158,000
Granted, Weighted Average per Share Grant Date Fair Value		$ 14.92	$ 14.62	$ 16.63
Outstanding at end of year, Shares		820,209	628,209	385,049
Director Stock Units [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense related to stock option grants		$ 1,664	$ (91)	$ 4,023
Restricted stock transactions
Outstanding at beginning of year, Shares		358,404	322,379
Outstanding at end of year, Shares		419,962	358,404	322,379

[1] Compensation expense associated with stock options accelerated in 2015 as a result of retirement provisions being met for certain stock option recipients.