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Noncontrolling Interest (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2007
Noncontrolling Interest [Line Items]    
Initial Public Offering Price Per Share   $ 210.00
Equity Method Investment, Ownership Percentage 28.90%  
Percentage Of Owned Of Subsidiaries Membership Units 87.30%  
Percentage Of Payment To Exchanging Llc Member In Cash Savings Under Tax Benefit Sharing Agreement 85.00%  
Remaining Percentage Of Payment To Exchanging Llc Member In Cash Savings Under Tax Benefit Sharing Agreement 15.00%  
Greenlight [Member]
   
Noncontrolling Interest [Line Items]    
Membership Units To Be Issued 69,382  
Thirdpoint [Member]
   
Noncontrolling Interest [Line Items]    
Membership Units To Be Issued 34,691  
Common Class B [Member]
   
Noncontrolling Interest [Line Items]    
Membership Units To Be Issued 897,903