Contract assets and contract liabilities (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($)
Contract assets, net
Balance at December 31, 2018	$ 468
Balance at March 31, 2019	1,117
Change	649
Contract liabilities, net
Balance at December 31, 2018	217,733
Balance at March 31, 2019	218,029
Change	296
Contract liability and performance obligations included in revenue
Amounts included in the beginning of period contract liability balance	28,871
Amounts associated with performance obligations satisfied in previous periods	$ 294
Revenue performance obligations
Practical expedient of remaining performance obligations	true
DAS
Revenue performance obligations
Remaining service performance obligations	$ 202,993
DAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01 \| Minimum
Revenue performance obligations
Remaining duration of contracts	1 year
DAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01 \| Maximum
Revenue performance obligations
Remaining duration of contracts	15 years
Wholesale-Wi-Fi
Revenue performance obligations
Remaining service performance obligations	$ 9,863
Wholesale-Wi-Fi \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01 \| Minimum
Revenue performance obligations
Remaining duration of contracts	1 year
Wholesale-Wi-Fi \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01 \| Maximum
Revenue performance obligations
Remaining duration of contracts	15 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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