Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Assets	$ 1,499	$ 0
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	1,600	1,800	$ (5,100)
Liabilities
Employee compensation and benefits	15,189	16,807
Total Liabilities	15,189	17,653
Discontinued Operations, Disposed of by Means Other than Sale [Member]
Liabilities
Post-retirement	0	846
Discontinued Operations, Disposed of by Means Other than Sale [Member]
Liabilities
Post-retirement	$ 1,499	$ 0