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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other intangible assets |  |  |
Gross amount | $ 148,395 | $ 148,395 |
Accumulated impairment losses and amortization | (93,924) | (82,937) |
Intangible Assets, Net, Excluding Goodwill [Roll Forward] |  |  |
Other intangible assets, net, beginning balance | 65,458 |  |
Other intangible assets, net, ending balance | 54,471 | 65,458 |
Intangible Assets, Net, Including Goodwill [Roll Forward] |  |  |
Goodwill and Other intangible assets, net, beginning balance | 251,186 |  |
Goodwill and Other intangible assets, net, ending balance | 243,145 | 251,186 |
Investments in other ventures, under equity method |  |  |
Goodwill |  |  |
Goodwill, gross amount | 12,318 | 12,318 | $ 12,318
Accumulated impairment losses and amortization | (4,500) | (4,500) | (4,500)
Goodwill | 7,818 | 7,818 | 7,818
Other intangible assets |  |  |
Gross amount | 51,796 | 51,796 | 51,796
Accumulated impairment losses and amortization | (42,880) | (39,934) | (36,460)
Intangible Assets, Net, Excluding Goodwill [Roll Forward] |  |  |
Other intangible assets, net, beginning balance | 11,862 | 15,336 |
Amortization | (2,946) | (3,474) |
Other intangible assets, net, ending balance | 8,916 | 11,862 |
Goodwill and Other intangible assets, Total |  |  |
Gross amount | 64,114 | 64,114 | 64,114
Accumulated impairment losses and amortization | (47,380) | (44,434) | $ (40,960)
Intangible Assets, Net, Including Goodwill [Roll Forward] |  |  |
Goodwill and Other intangible assets, net, beginning balance | 19,680 | 23,154 |
Amortization | (2,946) | (3,474) |
Goodwill and Other intangible assets, net, ending balance | $ 16,734 | $ 19,680 |

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- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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