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Stockholders' Equity (Narratives) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 14, 2018
Feb. 28, 2018
Feb. 28, 2017
Nov. 30, 2017
Jul. 17, 2014
Debt Instrument [Line Items]          
Common stock reserve (in shares)   12,602,735      
Stock repurchases   $ 6,787 $ 2,543    
Dividend paid in each quarter (in dollars per share)   $ 0.0250 $ 0.0250    
Cash dividends declared per common share (in dollars per share)   $ 0.025 $ 0.025    
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      
Shares Withheld to Pay Taxes [Member]          
Debt Instrument [Line Items]          
Stock repurchases   $ 6,800      
Treasury Stock, Shares, Acquired (in shares)   217,006      
PSU 2014 [Domain] | Performance Shares [Member]          
Debt Instrument [Line Items]          
Common Stock, Shares, Issued (in shares) 437,689        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 194,529        
Director Plan SARs [Domain]          
Debt Instrument [Line Items]          
Number of common stock, authorized, approved under a board approved stock repurchase program (in shares)         680,000
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%