Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Investment Categories) (Details)

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Basis of Presentation (Investment Categories) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Summary of investment categories    
Cost $ 2,687 $ 2,767
Gross unrealized gains (4,499) (2,914)
Gross unrealized losses 0 0
Estimated fair value 7,186 5,681
Short-term investments
   
Summary of investment categories    
Cost 1,426 1,426
Gross unrealized gains (4,499) (2,914)
Gross unrealized losses 0 0
Estimated fair value 5,925 4,340
Certificates of deposit-restricted
   
Summary of investment categories    
Cost 1,261 1,341
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Estimated fair value $ 1,261 $ 1,341