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Financial Instruments - Non-recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of the fair value measurements using significant unobservable inputs
Investment related impairment	$ 40,161	$ 8,005	$ 2,521
Non-recurring
Reconciliation of the fair value measurements using significant unobservable inputs
Investment related impairment	35,400	8,000	$ 2,500
Non-recurring | Certain investments under cost method and equity method were measured using significant unobservable inputs
Reconciliation of the fair value measurements using significant unobservable inputs
Fair value of investments	$ 0	$ 0
Significant Unobservable Inputs (Level 3) | Non-recurring | Minimum
Reconciliation of the fair value measurements using significant unobservable inputs
Discount rate (as a percent)	20.00%
Significant Unobservable Inputs (Level 3) | Non-recurring | Maximum
Reconciliation of the fair value measurements using significant unobservable inputs
Discount rate (as a percent)	22.00%

X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
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+ References

No definition available.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

+ References

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