Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Details)

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STOCKHOLDERS' EQUITY (Details) (USD $)
In Millions, except Share data
6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Front Line [Member]
Jun. 30, 2011
Front Line [Member]
Common Stock [Member]
Jun. 30, 2011
Front Line [Member]
Dec. 31, 2010
Front Line [Member]
Jun. 30, 2011
Liberty Media [Member]
Common Stock [Member]
Jun. 30, 2011
Liberty Media [Member]
Common Stock [Member]
Jun. 30, 2011
Vector [Member]
Common Stock [Member]
Jun. 30, 2011
Vector [Member]
Common Stock [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                
Shares issued in business combinations (in shares)   5,700,000         700,000 700,000
Common shares sold to related party pursuant to the subscription agreement (in shares)           1,800,000    
Additional common shares sold to related party pursuant to the subscription agreement (in shares)         5,500,000 5,500,000    
Cost of acquired entity, purchase price $ 14.7              
Redeemable Noncontrolling Interest [Line Items]                
Noncontrolling interest common stock repurchased (in shares)     27,821          
Noncontrolling interest vested options repurchased (in shares)     3,402          
Carrying value of common stock and vested options repurchased       82.4        
Noncontrolling interest restricted common shares repurchased (in shares)     15,376          
Carrying value of restricted common stock repurchased       24.0        
Fair value of redeemable put arrangements       22.5        
Carrying value of redeemable put arrangements       $ 22.5