Investments Short-Term Investments (Details) - Steel Excel - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Marketable Securities, Cost to Fair Value Reconciliation [Abstract]
Cost	$ 151,440		$ 151,440
Fair value	160,196		160,196
Securities sold during the period	26,804	$ 55,200	49,902	$ 95,700
Available for sale securities
Marketable Securities, Cost to Fair Value Reconciliation [Abstract]
Cost	151,440		151,440		$ 195,958
Gross Unrealized Gains	12,821		12,821		12,675
Gross Unrealized Losses	(4,065)		(4,065)		(27,495)
Fair value	160,196		160,196		181,138
Amounts classified as cash equivalents
Marketable Securities, Cost to Fair Value Reconciliation [Abstract]
Cost	39,697		39,697		42,681
Fair value	39,697		39,697		42,681
Amounts classified as marketable securities
Marketable Securities, Cost to Fair Value Reconciliation [Abstract]
Cost	111,743		111,743		153,277
Gross Unrealized Gains	12,821		12,821		12,675
Gross Unrealized Losses	(4,065)		(4,065)		(27,495)
Fair value	120,499		120,499		138,457
Short-term deposits | Available for sale securities
Marketable Securities, Cost to Fair Value Reconciliation [Abstract]
Cost	39,697		39,697		42,681
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	0		0		0
Fair value	39,697		39,697		42,681
Mutual funds | Available for sale securities
Marketable Securities, Cost to Fair Value Reconciliation [Abstract]
Cost	11,835		11,835		17,030
Gross Unrealized Gains	4,526		4,526		4,262
Gross Unrealized Losses	0		0		(322)
Fair value	16,361		16,361		20,970
Equity securities | Available for sale securities
Marketable Securities, Cost to Fair Value Reconciliation [Abstract]
Cost	64,703		64,703		103,761
Gross Unrealized Gains	7,636		7,636		7,821
Gross Unrealized Losses	(2,499)		(2,499)		(23,732)
Fair value	69,840		69,840		87,850
Corporate obligations | Available for sale securities
Marketable Securities, Cost to Fair Value Reconciliation [Abstract]
Cost	35,205		35,205		32,486
Gross Unrealized Gains	659		659		592
Gross Unrealized Losses	(1,566)		(1,566)		(3,441)
Fair value	$ 34,298		$ 34,298		$ 29,637