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
Mar. 31, 2014
Dec. 31, 2013
Summary of investment categories    
Cost $ 2,673 $ 2,767
Gross unrealized gains 10,943 2,914
Gross unrealized losses 0 0
Estimated fair value 13,616 5,681
Short-term investments
   
Summary of investment categories    
Cost 1,332 1,426
Gross unrealized gains 10,943 2,914
Gross unrealized losses 0 0
Estimated fair value 12,275 4,340
Certificates of deposit-restricted
   
Summary of investment categories    
Cost 1,341 1,341
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Estimated fair value $ 1,341 $ 1,341