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Summary of Significant Accounting Policies (Other Expense (Income), Net) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other expense (income), net [Line Items]          
Impairment Losses Related to Real Estate Partnerships   $ 8,000 $ 0 $ 8,017 $ 0
Write-off of deposits and pre-acquisition costs $ (9,600)   (16,992) (11,367) (17,157)
Interest Expense     (618) (503) (686)
Amortization of intangible assets     (13,800) (13,800) (13,800)
Equity in (earnings) loss of unconsolidated entities     2,690 (1,985) 8,337
Interest expense     (7,593) (2,537) (3,236)
Miscellaneous, net     (7,518) (5,540) (25,155)
Other expense, net     13,849 32,387 56,868
Charges related to contractual dispute         15,000
Home Building [Member]          
Other expense (income), net [Line Items]          
Lease exit and related costs     $ (240) $ (1,729) $ (11,643)