Contract assets and contract liabilities (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($)
Contract assets, net
Balance at December 31	$ 967
Balance at March 31	608
Change	(359)
Contract liabilities, net
Balance at December 31	227,889
Balance at March 31	237,690
Change	9,801
Contract liability and performance obligations included in revenue
Amounts included in the beginning of period contract liability balance	24,970
Amounts associated with performance obligations satisfied in previous periods	$ 13
Revenue performance obligations
Practical expedient of remaining performance obligations	true
DAS
Revenue performance obligations
Remaining service performance obligations	$ 222,221
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	$ 9,984
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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