Pension and Other Post-Retirement Benefits (WHX/Bear Pension Plan Assets) (Details) (Pension Benefits, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 323,493	$ 351,869	$ 328,726
U.S. large cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,548	27,819
U.S. large cap | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,548	27,226
U.S. large cap | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	593
U.S. large cap | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. mid-cap growth
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36,771	62,106
U.S. mid-cap growth | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36,771	62,106
U.S. mid-cap growth | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. mid-cap growth | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0	208
U.S. small-cap value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20,833	16,393
U.S. small-cap value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,207	14,374
U.S. small-cap value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,626	2,019
U.S. small-cap value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International large cap value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,058	16,258
International large cap value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,058	16,258
International large cap value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International large cap value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Emerging markets growth
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	375
Emerging markets growth | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	375
Emerging markets growth | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Emerging markets growth | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Equity contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,570	95
Equity contracts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	240	95
Equity contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,330	0
Equity contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Corporate bonds and loans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	50,895	63,561
Corporate bonds and loans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	33
Corporate bonds and loans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	50,895	63,028
Corporate bonds and loans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	500	545
Common trust funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	122,628	98,024
Common trust funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Common trust funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	122,628	98,024
Common trust funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fund of funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41,831	41,648
Fund of funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fund of funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41,831	41,648
Fund of funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Total fair value including futures contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	295,509	325,904
Total fair value including futures contracts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75,199	120,092
Total fair value including futures contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	220,310	205,312
Total fair value including futures contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	500
Shorts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(47,115)	(63,336)
Shorts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(46,909)	(62,404)
Shorts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(206)	(932)
Shorts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	248,394	262,568
Total | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,290	57,688
Total | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	220,104	204,380
Total | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	500
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75,099	93,571
Net payables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ (4,270)