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Related Party Transactions (Details) $ in Thousands	5 Months Ended	12 Months Ended
Related Party Transactions (Details) $ in Thousands	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) shares
Related Party Transactions
Payable to affiliates	$ 200	$ 80	$ 200
Securities Borrowed	220,005	1,471,172	220,005
Securities Loaned	222,203	754,687	222,203
Non-qualified stock options \| 2015 Management Incentive Plan
Related Party Transactions
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross \| shares				9,228,000
Industrial and Commercial Bank of China (“ICBC”)
Related Party Transactions
Securities Borrowed		23,100
Securities Loaned		1,100
Dell
Related Party Transactions
Payments for purchases		2,500	2,700	$ 3,600
Affiliate Of Founder And Executive Chairman
Related Party Transactions
Sublease revenue		$ 60	40	100
Two microwave communication network JVs
Related Party Transactions
Number of microwave communication network JVs the Company makes payments to \| item		2
Payments to related party		$ 8,300	600	0
Level 3
Related Party Transactions
Payments for purchases		2,500	2,400	4,300
Singtel
Related Party Transactions
Payments for purchases		100	200	100
Son of Company's Founder and Executive Chairman
Related Party Transactions
Total compensation			0	$ 800
Son of Company's Founder and Executive Chairman \| Class A \| Non-qualified stock options \| 2015 Management Incentive Plan
Related Party Transactions
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross \| shares				60,000
Member of Board of Directors
Related Party Transactions
Payments to related party		4	$ 30	$ 100
SBI
Related Party Transactions
Payments to related party	$ 2,200	$ 6,000