Sale of Subsidiary (Calculation of net gain on disposal of discontinued operations) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on disposal	$ 12,736
Discontinued Operations, Disposed of by Sale [Member] | Avon [Member]
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