Related Party Transactions (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) item	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) item	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Related Party Transactions
Payable to affiliates	$ 100		$ 100		$ 200
Dell
Related Party Transactions
Payments for purchases	500	$ 600	1,900	$ 2,100
Level 3
Related Party Transactions
Payments for purchases	$ 500	700	$ 1,600	1,900
Two microwave communication network JVs
Related Party Transactions
Number of microwave communication network JVs the Company makes payments to | item	2		2
Payments to related party	$ 3,900	$ 0	$ 4,200	$ 0