INCOME TAXES (Net Operating Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 31, 2015
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	$ 111,881	$ 7,730	$ 7,320
Tax effect of net operating loss carryforwards	211,045	90,958
Tax credit carryforwards	48,380	37,220
Tax liability relating to undistributed earnings of foreign subsidiaries	256	903
Change in valuation allowance	(91,052)	(7,730)	$ (7,320)
Valuation allowance	124,555	91,766
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Limitations on use	7,665
Handy & Harman Ltd. (HNH)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	71,300
Tax effect of net operating loss carryforwards	25,000
Tax credit carryforwards		$ 7,400
Undistributed earnings of foreign subsidiaries	6,200
Tax liability relating to undistributed earnings of foreign subsidiaries	2,500
Handy & Harman Ltd. (HNH) | JPS Industries
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	47,000
Handy & Harman Ltd. (HNH) | Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	71,300
Utilization of Federal net operating losses	57,300
Reduction of net operating loss	31,000
Tax effect of reduction of net operating loss carryforwards	10,800
WFH LLC (formerly CoSine) | Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	7,533
WFH LLC (formerly CoSine) | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	8,563
Steel Excel
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, stock based compensation	10,500
Steel Excel | Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	139,100
Federal research and development credit carryforwards	30,300
Steel Excel | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	156,100
Federal research and development credit carryforwards	17,700
WebFinancial Holding Corporation
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	329,600
Credit carryforward	7,540
Change in valuation allowance	111,881
Valuation allowance	12,900
WebFinancial Holding Corporation | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 77,500
DGT Holdings Corp. (DGT) (a)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards				$ 31,961
DGT Holdings Corp. (DGT) (a) | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards				$ 25,807