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Proxy Contest (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2018 director
Other Income and Expenses [Abstract]
Number of directors nominated by shareholder					5
Number of directors on board					8
Proxy contest | $	$ (459)	$ 0	$ 7,139	$ 0

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Professional Fees Expense (Income)

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