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Revenue (Contract Liabilities Balances) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Mar. 31, 2018 | Jan. 01, 2018
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Revenue from Contract with Customer [Abstract] |  |  |  |
Contract Liabilities | $ 146,824 | $ 28,858 | $ 67,715 | $ 25,520
LTG |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Remaining equity interest percentage acquired in equity investee |  | 67.50% |  |

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- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 + Details
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