Accumulated Other Comprehensive Loss (Details) $ in Thousands	6 Months Ended
	May 31, 2016 USD ($)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2015	$ (24,582)
Other comprehensive loss before reclassifications, net of tax	1,817
Amounts reclassified from accumulated other comprehensive loss to realized losses included in earnings	256
Balance, May 31, 2016	(22,509)
Unrealized Gains (Losses) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2015	(46)
Other comprehensive loss before reclassifications, net of tax	(3)
Amounts reclassified from accumulated other comprehensive loss to realized losses included in earnings	0
Balance, May 31, 2016	(49)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2015	(24,628)
Other comprehensive loss before reclassifications, net of tax	1,814
Amounts reclassified from accumulated other comprehensive loss to realized losses included in earnings	256
Balance, May 31, 2016	$ (22,558)