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Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Decrease in cash inflows from cash flows provided by operating activities | $ (1,221,701) | $ (1,025,787) | $ (484,772) |
Increase in cash flows used in investing activities | $ (2,536,613) | (122,434) | $ (164,532) |
Accounting Standards Update 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 |  |
Retained earnings | Accounting Standards Update 2016-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of adoption of new accounting principle in period of adoption |  |  |  | $ 2,200

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