Contract assets and contract liabilities (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Contract assets, net
Balance at January 1, 2018		$ 798
Balance at September 30, 2018	$ 911	911
Change		113
Contract liabilities, net
Balance at January 1, 2018		204,472
Balance at September 30, 2018	206,736	206,736
Change		2,264
Contract liability and performance obligations included in revenue
Amounts included in the beginning of period contract liability balance	16,572	66,864
Amounts associated with performance obligations satisfied in previous periods	67	$ 257
Revenue performance obligations
Practical expedient of remaining performance obligations		true
DAS
Revenue performance obligations
Remaining service performance obligations	$ 191,458	$ 191,458
DAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 \| Minimum
Revenue performance obligations
Remaining duration of contracts	1 year	1 year
DAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 \| Maximum
Revenue performance obligations
Remaining duration of contracts	16 years	16 years
Wholesale-Wi-Fi
Revenue performance obligations
Remaining service performance obligations	$ 9,439	$ 9,439
Wholesale-Wi-Fi \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 \| Minimum
Revenue performance obligations
Remaining duration of contracts	1 year	1 year
Wholesale-Wi-Fi \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 \| 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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