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Revenue (Breakdown of Revenues by Accounting Standards) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total Revenues | $ 911,402 | $ 1,547,141
Revenues under ASC 606 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total Revenues | 356,883 | 550,533
Revenues under ASC 840 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total Revenues | 26,228 | 52,257
Revenues under ASC 815 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Total Revenues | $ 528,291 | $ 944,351

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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