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Earnings Per Share (Basic and Diluted Earnings (Loss) Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Earnings Per Share [Abstract]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 3,600 9,700 3,600 9,700
Numerator:        
Net income $ 31,782 $ 15,597 $ 46,041 $ 28,724
Less: Distributed earnings allocated to nonvested restricted stock (14) (10) (29) (21)
Less: Undistributed earnings allocated to nonvested restricted stock (200) (66) (285) (116)
Numerator for basic earnings per share 31,568 15,521 45,727 28,587
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes 664 667 1,327 1,333
Add: Undistributed earnings allocated to nonvested restricted stock 200 66 285 116
Less: Undistributed earnings reallocated to nonvested restricted stock (175) (59) (251) (104)
Numerator for diluted earnings per share $ 32,257 $ 16,195 $ 47,088 $ 29,932
Denominator:        
Weighted average shares outstanding — basic (in shares) 85,445 84,196 85,285 86,704
Effect of dilutive securities: Share-based payments (in shares) 3,885 2,122 3,288 1,954
Effect of dilutive securities: Convertible senior notes (in shares) 8,402 8,402 8,402 8,402
Weighted average shares outstanding — diluted (in shares) 97,732 94,720 96,975 97,060
Basic earnings per share (in dollars per share) $ 0.37 $ 0.18 $ 0.54 $ 0.33
Diluted earnings per share (in dollars per share) $ 0.33 $ 0.17 $ 0.49 $ 0.31