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Goodwill and Other Intangible Assets (Schedule of Expected Impairment Charges and Amortization Expense) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]  
2018 $ 8,323
2019 7,873
2020 6,801
2021 5,612
2022 5,224
2023 and thereafter 10,371
Total remaining amortization expense 44,204
Indefinite lived 10,267
Total 54,471
Other intangible assets  
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]  
Total 45,555
Other intangible assets | Investments in other ventures, under equity method  
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]  
Total 8,916
Other intangible assets  
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]  
2018 5,727
2019 5,446
2020 5,237
2021 4,910
2022 4,522
2023 and thereafter 9,446
Total remaining amortization expense 35,288
Other intangible assets | Investments in other ventures, under equity method  
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]  
2018 2,596
2019 2,427
2020 1,564
2021 702
2022 702
2023 and thereafter 925
Total remaining amortization expense 8,916
Indefinite lived 0
Other intangible assets  
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]  
Indefinite lived $ 10,267