v3.8.0.1

Property and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property and equipment
Total property and equipment	$ 502,646	$ 423,323
Less: accumulated depreciation and amortization	(240,287)	(172,558)
Total property and equipment, net	262,359	250,765
Depreciation and amortization
Total depreciation and amortization of property and equipment	69,097	49,202	$ 38,293
Asset impairment charge
Losses on disposals of property and equipment	276
Construction in progress projects
Asset impairment charge
Impairment losses	882	54	215
Network access
Depreciation and amortization
Total depreciation and amortization of property and equipment	42,435	27,013	22,666
Network operations
Depreciation and amortization
Total depreciation and amortization of property and equipment	16,382	13,966	9,058
Development and technology
Depreciation and amortization
Total depreciation and amortization of property and equipment	9,247	7,207	5,441
General and administrative
Depreciation and amortization
Total depreciation and amortization of property and equipment	1,033	1,016	$ 1,128
Leasehold improvements
Property and equipment
Total property and equipment	418,023	358,477
Software
Property and equipment
Total property and equipment	42,281	33,349
Construction in progress
Property and equipment
Total property and equipment	27,291	18,859
Computer equipment
Property and equipment
Total property and equipment	13,245	10,878
Furniture, fixtures and office equipment
Property and equipment
Total property and equipment	1,806	1,760
Equipment acquired under capital leases
Property and equipment
Total property and equipment	12,714	8,780
Less: accumulated depreciation and amortization	$ (3,744)	$ (2,352)

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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