Fair Value Disclosures Fair Value Disclosures (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Measured at fair value on a recurring basis:
Residential mortgage loans available-for-sale	$ 221,607	$ 287,933
Disclosed at fair value:
Senior notes (fair value)	1,910,989	2,070,744
Fair Value, Inputs, Level 2 [Member]
Disclosed at fair value:
Financial Services debt (fair value)	58,506	105,664
Fair Value, Inputs, Level 1 [Member]
Disclosed at fair value:
Cash and equivalents (including restricted cash) (fair value)	1,272,541	1,653,044
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	7,680	3,139
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	(3,846)	4,340
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	(129)	105
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	$ 221,607	$ 287,933