Other balance sheet items - Schedule of Goodwill (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
Gross carrying value as of beginning of period	$ 51,731
Accumulated impairment loss as of beginning of period	0
Carrying value as of beginning of period	51,731
Additions (see Note 4)	27,297
Gross carrying value as of end of period	79,028
Accumulated impairment loss as of end of period	0
Carrying value as of end of period	79,028
Yucatàn Peninsula
Goodwill [Roll Forward]
Gross carrying value as of beginning of period	51,731
Accumulated impairment loss as of beginning of period	0
Carrying value as of beginning of period	51,731
Additions (see Note 4)	0
Gross carrying value as of end of period	51,731
Accumulated impairment loss as of end of period	0
Carrying value as of end of period	51,731
Pacific Coast
Goodwill [Roll Forward]
Gross carrying value as of beginning of period	0
Accumulated impairment loss as of beginning of period	0
Carrying value as of beginning of period	0
Additions (see Note 4)	0
Gross carrying value as of end of period	0
Accumulated impairment loss as of end of period	0
Carrying value as of end of period	0
Dominican Republic
Goodwill [Roll Forward]
Gross carrying value as of beginning of period	0
Accumulated impairment loss as of beginning of period	0
Carrying value as of beginning of period	0
Additions (see Note 4)	0
Gross carrying value as of end of period	0
Accumulated impairment loss as of end of period	0
Carrying value as of end of period	0
Jamaica
Goodwill [Roll Forward]
Gross carrying value as of beginning of period	0
Accumulated impairment loss as of beginning of period	0
Carrying value as of beginning of period	0
Additions (see Note 4)	27,297
Gross carrying value as of end of period	27,297
Accumulated impairment loss as of end of period	0
Carrying value as of end of period	$ 27,297

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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