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Basis of Presentation (Other Expense (Income), Net) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accounting Policies [Abstract]        
Write-offs of deposits and pre-acquisition costs $ (1,652) $ (5,063) $ (4,261) $ (6,718)
Amortization of intangible assets (3,450) (3,450) (6,900) (6,900)
Interest income 835 599 1,399 1,432
Interest expense (165) (134) (308) (271)
Equity in loss (earnings) of unconsolidated entities 265 (5,763) 1,226 (4,569)
Miscellaneous, net 2,211 (3,277) 5,581 (5,131)
Total other expense, net $ (1,956) (17,088) $ (3,263) $ (22,157)
Impairments of unconsolidated entities   $ 8,017