Fair Value Disclosures, Carrying and Fair Values of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011	Oct. 13, 2008	Sep. 30, 2012 4.50 % Convertible Senior Notes [Member]	Sep. 30, 2012 Corporate 7.50 Notes [Member]	Sep. 30, 2012 7.5% Senior Exchange Convertible Notes [Member]	Sep. 30, 2012 Carrying Amount [Member]	Dec. 31, 2011 Carrying Amount [Member]	Sep. 30, 2012 Fair Value [Member]	Dec. 31, 2011 Fair Value [Member]
Notes, mortgage notes and other debt [Abstract]
4.50% Notes							$ 5,402	$ 5,402	$ 5,361	$ 5,295
7.50% Notes							55,500	100,000	56,818	90,000
7.50% Exchange Notes							$ 44,500	$ 0	$ 47,059	$ 0
Stated interest rate (in hundredths)	7.50%	4.50%	4.50%	4.50%	7.50%	7.50%