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Stockholders' Equity (Narratives) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended
Apr. 08, 2014
Mar. 25, 2014
Jan. 29, 2013
Aug. 31, 2014
May 31, 2014
Feb. 28, 2014
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Aug. 31, 2014
Aug. 31, 2013
Nov. 30, 2013
Jul. 17, 2014
Director Stock Units [Domain]
Jul. 18, 2013
Director Stock Units [Domain]
Equity [Abstract]                            
Stock Issued During Period, Shares, New Issues 1,041,666 6,944,445 6,325,000                      
Common Stock, Par or Stated Value Per Share   $ 1.00 $ 1.00                      
Treasury Stock Acquired, Average Cost Per Share   $ 18.00 $ 18.25                      
Stock issued during period, shares, treasury stock reissued   7,986,111 6,325,000                      
Proceeds from issuance of common stock, net     $ 109,503             $ 137,045 $ 109,503      
Dividend paid in each quarter (in dollars per share)       $ 0.0250 $ 0.0250 $ 0.0250 $ 0.0250 $ 0.025 $ 0.025 $ 0.0750 $ 0.0750      
Debt Instrument [Line Items]                            
Number of common stock, authorized, approved under a board approved stock repurchase program       4,000,000           4,000,000     680,000  
Common Stock, Shares, Issued                           478,294
Common Stock, Shares Authorized                         680,000  
Common stock reserve, shares       12,602,735           12,602,735     679,815  
Treasury Stock, Value       $ 445,976           $ 445,976   $ 718,565   $ 7,900