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Fair Value Disclosures Fair Value Disclosures (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Disclosed at fair value:    
Senior notes, fair value $ 2,663,451 $ 2,765,151
Fair Value, Inputs, Level 1 [Member]
   
Disclosed at fair value:    
Cash and equivalents (including restricted cash) (fair value) 1,476,710 1,184,931
Fair Value, Inputs, Level 2 [Member]
   
Disclosed at fair value:    
Financial Services debt, fair value 138,795 0
Senior notes, fair value 2,663,451 2,765,151
House and land inventory [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
   
Measured at fair value on a non-recurring basis:    
Assets, Fair Value Disclosure, Nonrecurring 11,243 23,766
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Measured at fair value on a recurring basis:    
Assets, Fair Value Disclosure, Recurring 6,021 3,551
Forward Contracts [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Measured at fair value on a recurring basis:    
Assets, Fair Value Disclosure, Recurring (646) (3,470)
Whole Loan Commitments [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Measured at fair value on a recurring basis:    
Assets, Fair Value Disclosure, Recurring (55) 11
Residential Mortgage [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Measured at fair value on a recurring basis:    
Assets, Fair Value Disclosure, Recurring $ 318,931 $ 258,075