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Stockholders' Equity (Narratives) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 15, 2017
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Nov. 30, 2016
Debt Instrument [Line Items]            
Common stock reserve (in shares)   12,602,735   12,602,735    
Stock repurchases       $ 2,543 $ 87,531  
Dividend paid in each quarter (in dollars per share)   $ 0.0250 $ 0.0250 $ 0.05 $ 0.050  
Cash dividends declared per common share (in dollars per share)   $ 0.0250 $ 0.0250 $ 0.05 $ 0.05  
January 2016 Stock Repurchase Program [Member]            
Debt Instrument [Line Items]            
Number of common stock, authorized, approved under a board approved stock repurchase program (in shares)   1,627,000   1,627,000    
Shares Withheld to Pay Taxes [Member]            
Debt Instrument [Line Items]            
Stock repurchases       $ 2,543    
Treasury Stock, Shares, Acquired (in shares)       152,569    
PSU 2013 [Domain] | Performance Shares [Member]            
Debt Instrument [Line Items]            
Common Stock, Shares, Issued (in shares) 278,460          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 125,460          
Convertible Notes Payable [Member] | Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member]            
Debt Instrument [Line Items]            
Senior notes, rate   1.375%   1.375%   1.375%