Contract assets and contract liabilities (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)
Contract assets, net
Balance at January 1, 2018		$ 798
Balance at June 30, 2018	$ 217	217
Change		(581)
Contract liabilities, net
Balance at January 1, 2018		204,472
Balance at June 30, 2018	202,896	202,896
Change		(1,576)
Contract liability and performance obligations included in revenue
Amounts included in the beginning of period contract liability balance	23,598	50,292
Amounts associated with performance obligations satisfied in previous periods	97	$ 190
Revenue performance obligations
Practical expedient of remaining performance obligations		true
DAS
Revenue performance obligations
Remaining service performance obligations	$ 190,219	$ 190,219
DAS \| Minimum
Revenue performance obligations
Remaining duration of contracts	1 year	1 year
DAS \| Maximum
Revenue performance obligations
Remaining duration of contracts	16 years	16 years
Wholesale-Wi-Fi
Revenue performance obligations
Remaining service performance obligations	$ 7,365	$ 7,365
Wholesale-Wi-Fi \| Minimum
Revenue performance obligations
Remaining duration of contracts	1 year	1 year
Wholesale-Wi-Fi \| Maximum
Revenue performance obligations
Remaining duration of contracts	16 years	16 years

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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