Goodwill and Other Intangible Assets (Schedule of Expected Impairment Charges and Amortization Expense) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Other intangible assets
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Total	$ 56,966
Other intangible assets | Other intangible assets
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Total	39,828
Other intangible assets | Investments in other ventures, under equity method
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Total	17,138
Other intangible assets
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Indefinite lived	19,414
Other intangible assets | Other intangible assets
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Indefinite lived	10,267
Other intangible assets | Investments in other ventures, under equity method
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Indefinite lived	9,147
Other intangible assets
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
2019	8,261
2020	7,192
2021	6,005
2022	5,617
2023	4,724
2024 and thereafter	5,753
Total remaining amortization expense	37,552
Other intangible assets | Other intangible assets
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
2019	5,446
2020	5,237
2021	4,910
2022	4,522
2023	4,093
2024 and thereafter	5,353
Total remaining amortization expense	29,561
Other intangible assets | Investments in other ventures, under equity method
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
2019	2,815
2020	1,955
2021	1,095
2022	1,095
2023	631
2024 and thereafter	400
Total remaining amortization expense	$ 7,991