The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The amount of assets reported by an equity method investment of the entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

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Carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

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- Definition

This item represents the maximum exposure to loss for an equity method investment.

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No definition available.

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- Definition

Percentage of voting equity interests acquired in a joint venture.

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No definition available.

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- Definition

The number of other investors in a joint venture.

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The percentage ownership of equity of joint venture held be each investor.

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The percentage ownership of voting shares of joint venture held be each investor.

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Variable Interest Entity, Number Of Entities

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Summary of Significant Accounting Policies - Variable Interest Entities (Details) $ in Thousands	1 Months Ended
	Oct. 31, 2016 party	Dec. 31, 2019 USD ($) joint_venture	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Number of joint ventures considered as VIEs \| joint_venture		4
Equity investment, Carrying Amount, Asset		$ 28,579	$ 18,254
Equity investment, Carrying Amount, Liability		0	0
Equity investment, Maximum Exposure to Loss		28,579	18,254
Equity investment, VIEs' assets		$ 119,051	$ 49,450
JV building microwave communication networks in US and Asia
Variable Interest Entity [Line Items]
Number of other investors in JV \| party	9
Ownership of voting shares of JV held be each investor (as a percent)		10.00%
Ownership of equity of JV held be each investor (as a percent)		10.00%
JV building microwave communication networks in US and Europe
Variable Interest Entity [Line Items]
Ownership of voting shares (as a percent)		50.00%
Ownership interest		50.00%
JV offering derivatives trading technology and execution services
Variable Interest Entity [Line Items]
Ownership interest		10.00%
JV developing a member-owned equities exchange with the goal of increasing competition
Variable Interest Entity [Line Items]
Ownership interest		21.40%