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Goodwill and Other Intangible Assets (Schedule of Goodwill and Other Intangible Assets Included in Equity Method Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019
Other intangible assets |  |  |
Gross amount | $ 159,503 |  | $ 177,507
Accumulated impairment losses and amortization | (102,537) |  | (111,639)
Intangible Assets, Net, Excluding Goodwill [Roll Forward] |  |  |
Other intangible assets, net, ending balance | 56,966 |  |
Intangible Assets, Net, Including Goodwill [Roll Forward] |  |  |
Goodwill and Other intangible assets, net, ending balance | 237,418 |  |
Investments in other ventures, under equity method |  |  |
Goodwill |  |  |
Gross amount | 15,098 | $ 12,318 | 15,098
Accumulated impairment losses and amortization | (4,500) | (4,500) | (4,500)
Goodwill | 10,598 | 7,818 | 10,598
Acquired during the year | 0 | 2,780 |
Other intangible assets |  |  |
Gross amount | 62,904 | 51,796 | 62,908
Accumulated impairment losses and amortization | (45,766) | (42,880) | (48,582)
Intangible Assets, Net, Excluding Goodwill [Roll Forward] |  |  |
Other intangible assets, net, beginning balance | 8,916 |  |
Acquired during the year | 4 | 11,108 |
Amortization | (2,816) | (2,886) |
Other intangible assets, net, ending balance | 17,138 | 8,916 |
Goodwill and Other intangible assets, Total |  |  |
Gross amount | 78,002 | 64,114 | 78,006
Accumulated impairment losses and amortization | (50,266) | (47,380) | $ (53,082)
Intangible Assets, Net, Including Goodwill [Roll Forward] |  |  |
Goodwill and Other intangible assets, net, beginning balance | 16,734 |  |
Acquired during the year | 4 | 13,888 |
Amortization | (2,816) | (2,886) |
Goodwill and Other intangible assets, net, ending balance | $ 27,736 | $ 16,734 |

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