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Goodwill and Other Intangible Assets (Schedule of Goodwill and Other Intangible Assets Included in Equity Method Investments) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Other intangible assets |  |  |
Gross amount | $ 148,395 | $ 148,395 |
Accumulated impairment losses and amortization | (82,937) | (65,495) |
Intangible Assets, Net, Excluding Goodwill [Roll Forward] |  |  |
Other intangible assets, Net, Beginning of Period | 82,900 |  |
Other intangible assets, Net, End of Period | 65,458 | 82,900 |
Intangible Assets, Net, Including Goodwill [Roll Forward] |  |  |
Goodwill and Other intangible assets, Net, Beginning of Period | 265,154 |  |
Goodwill and Other intangible assets, Net, End of Period | 251,186 | 265,154 |
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) | 0
Goodwill [Roll Forward] |  |  |
Goodwill, Net, Beginning of Period | 7,818 | 12,318 |
Acquired during the year |  | 0 |
Impairment losses |  | (4,500) |
Goodwill, Net, End of Period | 7,818 | 7,818 |
Other intangible assets |  |  |
Gross amount | 51,796 | 51,796 | 45,400
Accumulated impairment losses and amortization | (39,934) | (36,460) | (32,466)
Intangible Assets, Net, Excluding Goodwill [Roll Forward] |  |  |
Other intangible assets, Net, Beginning of Period | 15,336 | 12,934 |
Acquired during the year |  | 6,396 |
Amortization | (3,474) | (2,900) |
Impairment losses |  | (1,094) |
Other intangible assets, Net, End of Period | 11,862 | 15,336 |
Goodwill and Other intangible assets, Total |  |  |
Gross amount, Beginning of Period | 64,114 | 64,114 | 57,718
Accumulated impairment losses and amortization, Beginning of Period | (44,434) | (40,960) | $ (32,466)
Intangible Assets, Net, Including Goodwill [Roll Forward] |  |  |
Goodwill and Other intangible assets, Net, Beginning of Period | 23,154 | 25,252 |
Acquired during the year |  | 6,396 |
Amortization | (3,474) | (2,900) |
Impairment losses |  | (5,594) |
Goodwill and Other intangible assets, Net, End of Period | $ 19,680 | $ 23,154 |

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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