Contract assets and contract liabilities (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Contract assets, net
Balance at January 1, 2018	$ 798
Balance at March 31, 2018	111
Change	(687)
Contract liabilities, net
Balance at January 1, 2018	204,472
Balance at March 31, 2018	201,514
Change	(2,958)
Contract liability and performance obligations included in revenue
Amounts included in the beginning of period contract liability balance	26,694
Amounts associated with performance obligations satisfied in previous periods	$ 93
Revenue performance obligations
Practical expedient of remaining performance obligations	true
DAS
Revenue performance obligations
Remaining service performance obligations	$ 190,404
DAS \| Minimum
Revenue performance obligations
Remaining duration of contracts	1 year
DAS \| Maximum
Revenue performance obligations
Remaining duration of contracts	16 years
Wholesale-Wi-Fi
Revenue performance obligations
Remaining service performance obligations	$ 7,979
Wholesale-Wi-Fi \| Minimum
Revenue performance obligations
Remaining duration of contracts	1 year
Wholesale-Wi-Fi \| 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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