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Goodwill and Other Intangible Assets (Schedule of Intangible Assets and Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other intangible assets |  |  |
Gross amount | $ 159,503 | $ 148,395 |
Accumulated impairment losses and amortization | (102,537) | (93,924) |
Intangible Assets, Net, Excluding Goodwill [Roll Forward] |  |  |
Other intangible assets, net, beginning balance | 54,471 |  |
Other intangible assets, net, ending balance | 56,966 | 54,471 |
Intangible Assets, Net, Including Goodwill [Roll Forward] |  |  |
Goodwill and Other intangible assets, net, beginning balance | 243,145 |  |
Goodwill and Other intangible assets, net, ending balance | 237,418 | 243,145 |
Excluding Equity Method Investments |  |  |
Goodwill |  |  |
Gross amount | 199,889 | 199,889 | $ 199,889
Accumulated impairment losses and amortization | (2,299) | (2,299) | (2,299)
Goodwill | 197,590 | 197,590 | 197,590
Other intangible assets |  |  |
Gross amount | 96,599 | 96,599 | 96,599
Accumulated impairment losses and amortization | (56,771) | (51,044) | (43,003)
Intangible Assets, Net, Excluding Goodwill [Roll Forward] |  |  |
Other intangible assets, net, beginning balance | 45,555 | 53,596 |
Amortization | (5,727) | (8,041) |
Other intangible assets, net, ending balance | 39,828 | 45,555 |
Goodwill and Other intangible assets, Total |  |  |
Gross amount | 296,488 | 296,488 | 296,488
Accumulated impairment losses and amortization | (59,070) | (53,343) | $ (45,302)
Intangible Assets, Net, Including Goodwill [Roll Forward] |  |  |
Goodwill and Other intangible assets, net, beginning balance | 243,145 | 251,186 |
Amortization | (5,727) | (8,041) |
Goodwill and Other intangible assets, net, ending balance | $ 237,418 | $ 243,145 |

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