Pension and Other Post-Retirement Benefits (WHX/Bear Pension Plan Assets) (Details) - Pension Benefits - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 331,872	$ 347,921	$ 323,493
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,375	0
Convertible promissory notes | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,500	0
Stock warrants | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	875	0
Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	331,872	347,921
Plan assets at net asset value	95,045	129,007
Recurring | U.S. mid-cap blend
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22,560
Recurring | U.S. mid-cap blend | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22,560
Recurring | U.S. mid-cap blend | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Recurring | U.S. mid-cap blend | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Recurring | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	34,256	35,081
Recurring | Other | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	34,256
Recurring | Other | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Other | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Convertible promissory notes
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,500
Recurring | Convertible promissory notes | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,500
Recurring | Stock warrants
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	875
Recurring | Stock warrants | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	875
Recurring | Credit contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		3,100
Recurring | Credit contract | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Recurring | Credit contract | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		3,100
Recurring | Credit contract | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Recurring | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	61,191	3,100
Recurring | Subtotal | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56,816	0
Recurring | Subtotal | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		3,100
Recurring | Subtotal | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,375	0
Recurring | Hedge funds: (2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Hedge funds: (2) | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Hedge funds: (2) | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Hedge funds: (2) | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Equity long/short
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,832	2,706
Recurring | Equity long/short | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Equity long/short | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Equity long/short | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Event driven
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47,771	45,660
Recurring | Event driven | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Event driven | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Event driven | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Value driven
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,648
Recurring | Fund of funds - cap growth
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,325	4,531
Recurring | Common trust funds: (2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Common trust funds: (2) | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Common trust funds: (2) | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Common trust funds: (2) | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Mid-cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		9,040
Recurring | Mid-cap equity | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Mid-cap equity | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Mid-cap equity | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Recurring | Small-cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		5,158
Recurring | International equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,664
Recurring | Intermediate bond fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		6,492
Recurring | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	78	662
Recurring | Insurance separate account (4)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,391	15,013
Recurring | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	175,435	166,503
Recurring | Net receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 201	$ 49,311