Inventory And Land Held For Sale Inventory and Land Held for Sale (Land-related Charges) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Land impairments		$ 88,952	$ 1,074	$ 7,347
Net realizable value adjustments (NRV) - land held for sale	$ 81,000	83,576	1,105	(901)
Impairment Losses Related to Real Estate Partnerships	$ 8,000	8,017	0	0
Write-off of deposits and pre-acquisition costs		11,367	17,157	5,021
Total land-related charges		$ 191,912	$ 19,336	$ 11,467
Maximum [Member]
Fair Value Inputs, Discount Rate		25.00%
Minimum [Member]
Fair Value Inputs, Discount Rate		12.00%

Charge against earnings in the period to reduce the current value of land held for sale to its fair value.

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- Definition

Write Off Of Deposits And Pre Acquisition Costs

+ References

No definition available.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Impairment losses measured as the amount by which the carrying amount of the business or real estate partnerships exceeds the fair value of the business or partnership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

+ Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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