Restructuring charges - Restructuring Liability (Details) - First quarter 2017 restructuring [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs		$ (73)
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016		4,470
Restructuring charges		(73)
Cash paid		(1,736)
Restructuring liability as of December 31, 2017		2,661
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 10,300	0
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016		0
Cash paid		0
Restructuring liability as of December 31, 2017		0
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016		4,470
Cash paid		(1,736)
Restructuring liability as of December 31, 2017		$ 2,661

Restructuring Charges, Excluding Stock-based Compensation

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- Definition

Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

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