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Summary of Significant Accounting Policies (Other Expense (Income), Net) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other expense (income), net [Line Items] |  |  |  |
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
Amortization of intangible assets |  | 13,800 | 13,800 | 12,900
Equity in (earnings) loss of unconsolidated entities |  | 1,985 | (8,337) | (7,355)
Interest income |  | (2,537) | (3,236) | (3,107)
Interest expense |  | 503 | 686 | 788
Miscellaneous, net |  | 1,104 | 17,101 | 6,653
Other expense, net |  | 27,951 | 48,814 | 17,363
Charges related to contractual dispute |  |  | 15,000 | 20,000
Homebuilding [Member] |  |  |  |
Other expense (income), net [Line Items] |  |  |  |
Lease exit and related costs |  | 1,729 | 11,643 | 2,463
Equity in (earnings) loss of unconsolidated entities |  | $ 2,610 | $ (7,806) | $ (7,355)

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