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Basis of Presentation (Other Expense (Income), Net) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accounting Policies [Abstract]    
Write-offs of deposits and pre-acquisition costs $ (2,609) $ (1,655)
Amortization of intangible assets (3,450) (3,450)
Interest income 564 833
Interest expense (143) (137)
Equity in loss (earnings) of unconsolidated entities 961 1,193
Miscellaneous, net 3,369 (1,856)
Other expense (income), net $ (1,308) $ (5,072)