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Basis of Presentation (Other Expense (Income), Net) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accounting Policies [Abstract]          
Write-offs of deposits and pre-acquisition costs $ (3,136) $ (2,680) $ (5,063) $ (7,398) $ (9,397)
Amortization of intangible assets (3,450) (3,450)   (10,350) (10,350)
Interest income 1,842 485   3,240 1,917
Interest expense (152) (101)   (460) (371)
Equity in earnings (loss) of unconsolidated entities 886 415   2,112 (4,154)
Miscellaneous, net 522 (951)   6,103 (6,084)
Total other expense, net $ (3,488) $ (6,282)   $ (6,753) (28,439)
Impairments of unconsolidated entities     $ 8,017   $ 8,000