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Significant Accounting Policies (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Decrease in cash inflows from cash flows provided by operating activities | $ (888,526) | $ (601,702) |
Increase in cash flows used in investing activities | $ 2,064,305 | 194,857 |
Reclassification effect of adoption of ASU 2016-15 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Decrease in cash inflows from cash flows provided by operating activities |  | 20,000 |
Increase in cash flows used in investing activities |  | $ 20,000 |
Cumulative effect of adoption of ASU 2016-09 | Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  | $ 2,200

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