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Quarterly results (unaudited) (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended							12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Jun. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unaudited Quarterly Information [Abstract]
Land-related charges		$ 24,400	$ 3,900	$ 6,800	$ 700			$ 17,195	$ 35,786	$ 216,352
Loss on debt retirements	32,100	2,100		3,500				32,071	5,638	38,920
Mortgage repurchase provision	49,000	40,000		19,300				49,025	59,349	16,856
Goodwill, Impairment Loss			$ 240,500			$ 654,900	$ 1,400	$ 0	$ 240,541	$ 656,298

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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Nonrecurring impairment charges related to the write-off of production-related equipment and inventory. This tag is used when an Entity charges this cost to cost of goods sold.

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