Contract assets and contract liabilities (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)
Contract Assets, Net
Balance at January 1, 2018	$ 798
Balance at December 31, 2018	468
Change	(330)
Contract Liabilities, Net
Balance at January 1, 2018	204,472
Balance at December 31, 2018	217,733
Change	13,261
Contract liability and performance obligations included in revenue
Amounts included in the beginning of period contract liability balance	85,592
Amounts associated with performance obligations satisfied in previous periods	$ 378
Revenue performance obligations
Practical expedient of remaining performance obligations	true
DAS
Revenue performance obligations
Remaining service performance obligations	$ 202,113
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
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
Wholesale-Wi-Fi
Revenue performance obligations
Remaining service performance obligations	$ 9,999
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
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

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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