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Income taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 8,474	$ (2,947)	$ 22,975	$ 2,574
Effective tax rate (percent)	31.10%	(25.20%)	24.60%	30.60%
Gross unrecognized tax benefits	$ 25,200		$ 25,200		$ 16,600
Unrecognized tax benefits that would be recorded as reduction in income tax provision, if recognized	$ 23,600		$ 23,600

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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