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Related Party Transactions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) joint_venture	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transactions
Payable to affiliates	$ 1,300		$ 100
Securities loaned	936,061		754,687
Securities borrowed	1,232,048		1,471,172
Industrial and Commercial Bank of China (“ICBC”)
Related Party Transactions
Securities loaned	700		1,100
Securities borrowed			$ 23,100
Dell
Related Party Transactions
Payments for purchases	600	$ 800
Markit Group Holdings Limited
Related Party Transactions
Payments for purchases	400
Level 3
Related Party Transactions
Payments for purchases	700	700
Two microwave communication network JVs
Related Party Transactions
Payments to related party	$ 5,600	100
Number of microwave communication network JVs the Company makes payments to | joint_venture	2
SBI
Related Party Transactions
Payments to related party	$ 2,300	$ 1,500

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Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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