Fair Values of Financial and Nonfinancial Instruments (Details 3) (USD $)	6 Months Ended								6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Measured on a non-recurring basis	Dec. 31, 2010 Measured on a non-recurring basis	Jun. 30, 2011 Measured on a non-recurring basis Level 3 Housing inventory and inventory held-for-sale	Dec. 31, 2010 Measured on a non-recurring basis Level 3 Housing inventory and inventory held-for-sale	Jun. 30, 2011 Measured on a non-recurring basis Level 3 Other assets held-for-sale and investments in joint ventures	Dec. 31, 2010 Measured on a non-recurring basis Level 3 Other assets held-for-sale and investments in joint ventures	Jun. 30, 2011 Level 3 Housing inventory and inventory held-for-sale	Dec. 31, 2010 Level 3 Housing inventory and inventory held-for-sale	Dec. 31, 2010 Level 3 Other assets held-for-sale	Jun. 30, 2011 Level 3 Investments in joint ventures:	Dec. 31, 2010 Level 3 Investments in joint ventures:
Nonfinancial instruments measured on nonrecurring basis
Impairment charges	$ 15,679,000	$ 13,578,000							$ 13,200,000	$ 33,300,000	$ 235,000	$ 1,900,000	$ 4,100,000
Fair value of impaired assets			$ 14,934,000	$ 35,264,000	$ 13,643,000	$ 32,196,000	$ 1,291,000	$ 3,068,000			$ 1,600,000	$ 1,300,000	$ 1,400,000