v3.21.1

Contract assets and contract liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Contract Assets, Net
Balance at December 31	$ 547
Balance at March 31	473
Change	(74)
Contract Liabilities, Net
Balance at December 31	224,754
Balance at March 31	236,465
Change	11,711
Contract assets	766
Contract Liabilities	1,990
Contract liability and performance obligations included in revenue
Amounts included in the beginning of period contract liability balance	$ 28,348	$ 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	$ 224,687
DAS | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 | Minimum
Revenue performance obligations
Remaining duration of contracts	1 year
DAS | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 | Maximum
Revenue performance obligations
Remaining duration of contracts	13 years
Wholesale-Wi-Fi
Revenue performance obligations
Remaining service performance obligations	$ 5,139
Wholesale-Wi-Fi | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 | Minimum
Revenue performance obligations
Remaining duration of contracts	1 year
Wholesale-Wi-Fi | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 | Maximum
Revenue performance obligations
Remaining duration of contracts	13 years

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