Sale of Subsidiary (Calculation of net gain on disposal of discontinued operations) (Details) - Discontinued Operations, Disposed of by Sale - Avon $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from the transaction	$ 29,276
Compensation expense related to the transaction	2,588
Broker fees	935
Other transaction costs	594
Net cash proceeds	25,159
Net assets sold	(12,423)
Net gain on disposal	$ 12,736