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Investments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Available for Sale Securities [Abstract]          
Cost or Amortized Cost $ 9,150   $ 9,150   $ 9,150
Net Unrealized Gain (Loss) 450   450   50
Fair Value 9,600 9,400 9,600 9,400  
Changes in fair value of investments [Roll Forward]          
Fair value at beginning of period 9,800 9,300 9,200 8,500  
Change in net unrealized gain (loss) (200) 100 400 900  
Fair value at end of period 9,600 9,400 9,600 9,400  
Minimum [Member]
         
Changes in fair value of investments [Roll Forward]          
Fair Value Inputs Discount Rate     1.40%    
Fair Value Input, Interest Rate Premium (in hundredths)     4.00%    
Time horizon present value calculations     3 years    
Maximum [Member]
         
Changes in fair value of investments [Roll Forward]          
Fair Value Inputs Discount Rate     2.60%    
Fair Value Input, Interest Rate Premium (in hundredths)     13.00%    
Time horizon present value calculations     8 years    
Debt Securities [Member]
         
Schedule of Available-for-sale Securities [Line Items]          
Contractual maturities for debt securities, low range     12 years    
Available for Sale Securities [Abstract]          
Cost or Amortized Cost 7,150   7,150   7,150
Net Unrealized Gain (Loss) 50   50   (250)
Fair Value 7,200 6,700 7,200 6,700  
Changes in fair value of investments [Roll Forward]          
Fair value at beginning of period 7,200 6,700 6,900 6,100  
Change in net unrealized gain (loss) 0 0 300 600  
Fair value at end of period 7,200 6,700 7,200 6,700  
Equity Securities [Member]
         
Available for Sale Securities [Abstract]          
Cost or Amortized Cost 2,000   2,000   2,000
Net Unrealized Gain (Loss) 400   400   300
Fair Value 2,400 2,700 2,400 2,700  
Changes in fair value of investments [Roll Forward]          
Fair value at beginning of period 2,600 2,600 2,300 2,400  
Change in net unrealized gain (loss) (200) 100 100 300  
Fair value at end of period 2,400 2,700 2,400 2,700  
Preferred Stock Investments [Member]
         
Available for Sale Securities [Abstract]          
Cost or Amortized Cost 0   0   0
Fair Value 0   0   0
Changes in fair value of investments [Roll Forward]          
Fair value at beginning of period         0
Fair value at end of period $ 0   $ 0   $ 0