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.

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Name:	us-gaap_SeveranceCosts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Workforce Reduction (Details) $ in Thousands		3 Months Ended	6 Months Ended
Workforce Reduction (Details) $ in Thousands	Feb. 07, 2019 employee	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Restructuring expenses
Restructuring expenses		$ 490	$ 3,818
Reduction in Workforce, February 7, 2019
Workforce Reduction
Number of employees expected to be eliminated \| employee	35
Restructuring expenses
Employee severance, benefits and related costs		$ 500	$ 3,800