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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585

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No definition available.

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Significant Accounting Policies Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2018	Jun. 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		$ (349,111)	$ (321,023)
Increase in cash flows used in investing activities		$ 1,421,932	$ (57,541)
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
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