Inventory Inventory (Summary of Land-related Charges) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Inventory Disclosure [Abstract]
Land inventory impairments	$ 31,487	$ 0	$ 31,487	$ 0
Net realizable value adjustments (NRV) - land held for sale	81,006	200	82,886	68
Impairments of unconsolidated entities	8,017	0	8,017	0
Write-offs of deposits and pre-acquisition costs	5,063	7,414	6,718	10,454
Total land-related charges	$ 125,573	$ 7,614	$ 129,108	$ 10,522