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Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies (Fair Value) (Details) (USD $)
3 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities measured at fair value $ 0  
Impairment of debt and equity securities 0  
Convertible junior subordinated debentures due to an affiliate 89,770,000 89,770,000
Junior Subordinated Debt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instrument interest rate (in Percent) 7.00%  
Aggregate fair market value of debt instrument $ 88,000,000