Senior Notes Payable (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended				1 Months Ended
	Jan. 31, 2013 debtissuances	Jan. 31, 2012	Oct. 31, 2012	Jan. 31, 2013 Senior Notes Issued for Cash [Member]	Nov. 30, 2012 Six Point Eight Seven Five Percent Senior Notes Due Two Thousand and Twelve [Member]	Nov. 22, 2002 Six Point Eight Seven Five Percent Senior Notes Due Two Thousand and Twelve [Member]
Debt Instrument [Line Items]
Number of issuances of senior debt	7
Senior Note Payable (Textual) [Abstract]
Issued Senior Notes	$ 2,021,897		$ 2,080,463	$ 2,030,000
Repayments of Senior Debt	$ 59,068				$ 59,068
Debt Instrument, Interest Rate, Stated Percentage						6.875%