• Filing Date: 2013-03-14
  • Form Type: 10-K
  • Description: Annual report
v2.4.0.6
Investments (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Bank
Firm
Contract
Dec. 31, 2011
Contract
Bank
Dec. 31, 2010
Contract
Dec. 31, 2009
Investments (Additional Textual) [Abstract]        
Cash and cash equivalents $ 230,214,000 $ 100,355,000 $ 54,849,000 $ 43,453,000
Investments (Textual) [Abstract]        
Net Proceeds from Equity Option Contracts   89,000 391,000  
Gross realized gains and losses from equity option contracts   49,000 327,000  
Option Contract at Balance Sheet Date   0 0  
Number of Option Contract held during the year 0 0    
Number of custodial firms 2      
Number of national banks 2 1    
Deposits representing cash and cash equivalents in percentage 90.70%      
Real Estate Investment [Member]
       
Investments (Additional Textual) [Abstract]        
Depreciation and amortization expenses under other investments 279,000 60,000    
Custodial Firms [Member]
       
Investments (Additional Textual) [Abstract]        
Cash and cash equivalents 23,000,000 18,000,000    
Bank Time Deposits [Member]
       
Investments (Additional Textual) [Abstract]        
Cash and cash equivalents $ 208,900,000 $ 62,800,000