Stockholders' Equity (Narratives) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015	Feb. 29, 2016	Jan. 12, 2016	Nov. 30, 2015
Equity [Abstract]
Dividend paid in each quarter (in dollars per share)	$ 0.0250	$ 0.0250	$ 0.05	$ 0.05
Debt Instrument [Line Items]
Number of common stock, authorized, approved under a board approved stock repurchase program							4,000,000
Common stock reserve, shares	12,602,735		12,602,735
Treasury Stock, Value	$ 534,574		$ 534,574				$ 447,043
Stock repurchases			87,531	$ 300
January 2016 Stock Repurchase Program [Member]
Debt Instrument [Line Items]
Number of common stock, authorized, approved under a board approved stock repurchase program						10,000,000
Stock repurchases			$ 85,900
Treasury Stock, Shares, Acquired	0		8,373,000
Shares Withheld to Pay Taxes [Member]
Debt Instrument [Line Items]
Stock repurchases			$ 1,600
Treasury Stock, Shares, Acquired			155,789
Performance Shares [Member]
Debt Instrument [Line Items]
Common Stock, Shares, Issued					374,630