v3.8.0.1

Property and equipment - Summary by type (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property and equipment
Total property and equipment	$ 504,063	$ 502,646
Less: accumulated depreciation and amortization	(239,434)	(240,287)
Total property and equipment, net	264,629	262,359
Leasehold improvements
Property and equipment
Total property and equipment	408,360	418,023
Software
Property and equipment
Total property and equipment	44,575	42,281
Construction in progress
Property and equipment
Total property and equipment	37,027	27,291
Computer equipment
Property and equipment
Total property and equipment	12,332	13,245
Furniture, fixtures and office equipment
Property and equipment
Total property and equipment	$ 1,769	$ 1,806

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-Section S99
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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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