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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