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Guarantees and Indemnifications Warranty Rollforward (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2012
Dec. 31, 2010
Warranty Reserve Rollforward [Abstract]      
Warranty reserves, beginning of period $ 8,335 $ 9,025 $ 8,657
Warranty expense on homes delivered during the period 4,526 5,853 5,096
Changes in estimates for pre-existing warranties 1,891 1,690 1,118
Settlements made during the period (5,727) (6,130) (6,536)
Warranty reserves, end of period $ 9,025 $ 10,438 $ 8,335