DEBT AND CREDIT FACILITIES (Details) (USD $)	6 Months Ended		6 Months Ended										1 Months Ended		3 Months Ended	6 Months Ended
	May 31, 2014	Nov. 30, 2013	May 31, 2014 Minimum	May 31, 2014 Maximum	May 31, 2014 Cash Borrowings	May 31, 2014 Swing Line Loans	May 31, 2014 Letters of Credit	May 31, 2014 Additional Borrowings For Letters Of Credit Or Cash	May 31, 2014 Revolving Line Of Credit	May 31, 2014 Letter Of Credit Two	May 31, 2014 Guarantee Credit Line	Nov. 30, 2013 Guarantee Credit Line	Jun. 30, 2003 Mortgage Note	May 31, 2013 Mortgage Note	May 31, 2014 Convertible Debt	May 31, 2014 Convertible Debt
Line of Credit Facility [Line Items]
Mortgage note payable, face amount													$ 54,000,000
Balance outstanding														34,700,000
Unsecured revolving credit facility maturity date					Dec. 19, 2016
Revolving credit facility capacity					250,000,000.0	10,000,000.0	50,000,000.0		10,000,000
Lines of credit facility maximum borrowings capacity increase								100,000,000.0
Lines of credit facility potential maximum borrowings capacity								350,000,000.0
Basis spread on variable rate			0.25%	1.25%
Spread over LIBOR			1.25%	2.25%
Base rate spread over federal fund rate	0.50%
LIBOR rate interest period	1 month
Base rate spread over LIBOR	1.00%
Loan origination fees and issuance costs															3,300,000	3,400,000
Interest expense amortization period	5 years
Default applicable interest rate on all obligations	2.00%
Interest coverage ratio			3.50
Leverage ratio				2.75
Credit facility outstanding										1,800,000
Guarantee facility, maximum capacity											16,300,000
Bank guarantees											13,200,000	13,700,000
Restricted cash	$ 14,100,000	$ 15,700,000