Contract assets and contract liabilities (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Contract Assets, Net
Balance at December 31		$ 967
Balance at September 30	$ 760	760
Change		(207)
Contract Liabilities, Net
Balance at December 31		227,889
Balance at September 30	230,770	230,770
Change		2,881
Contract liability and performance obligations included in revenue
Amounts included in the beginning of period contract liability balance	19,020	65,126
Amounts associated with performance obligations satisfied in previous periods	(100)	$ (81)
Revenue performance obligations
Practical expedient of remaining performance obligations		true
DAS
Revenue performance obligations
Remaining service performance obligations	$ 217,354	$ 217,354
DAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 \| Minimum
Revenue performance obligations
Remaining duration of contracts	1 year	1 year
DAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 \| Maximum
Revenue performance obligations
Remaining duration of contracts	14 years	14 years
Wholesale-Wi-Fi
Revenue performance obligations
Remaining service performance obligations	$ 8,746	$ 8,746
Wholesale-Wi-Fi \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01 \| 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]: 2020-10-01 \| Maximum
Revenue performance obligations
Remaining duration of contracts	14 years	14 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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