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Investments in Affiliated Companies - Narratives (Details) - Business Combination - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Business Acquisition |  |  |  |  |
Purchase accounting fair value adjustments |  |  | $ 259,725 |  | $ 264,700
Charges related to purchase accounting fair value adjustments | $ 1,658 | $ 1,658 | $ 4,975 | $ 6,941 |

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- Definition Amount of increase (decrease) in income that would have been recognized in previous periods if the adjustments to provisional amounts were recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472 + Details
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