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Summary of significant accounting policies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating lease ROU asset	$ 10,700		$ 11,300
Allowance for doubtful accounts receivable	300			$ 700
Deferred tax liability	122,032			122,032
Retained earnings (accumulated deficit)	(1,011,036)			$ (938,923)
ASC 606 Adjustment	$ 0	$ (3,937)
Adjustments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings (accumulated deficit)					$ 3,300

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