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Investments (Tables)
 6 Months Ended
Jun. 30, 2012
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities [Table Text Block]

The amortized cost and estimated fair value of investments in debt and equity securities by category is as follows (in thousands):

 

          Gross     Gross        
    Amortized     Unrealized     Unrealized     Fair  
As of June 30, 2012   Cost     Gains     Losses     Value  
                         
U.S. Treasury securities and obligations of U.S. Government   $ 15,119     $ 13     $ (5 )   $ 15,127  
Corporate bonds     100,613       2,602       (1,193 )     102,022  
Collateralized corporate bank loans     109,853       320       (1,310 )     108,863  
Municipal bonds     167,940       4,280       (2,765 )     169,455  
Mortgage-backed     3,527       86       (11 )     3,602  
                                 
Total debt securities     397,052       7,301       (5,284 )     399,069  
                                 
Financial services     10,999       3,298       (3 )     14,294  
All other     19,120       7,509       (208 )     26,421  
                                 
Total equity securities     30,119       10,807       (211 )     40,715  
                                 
Total debt and equity securities   $ 427,171     $ 18,108     $ (5,495 )   $ 439,784  
                                 
As of December 31, 2011                                
                                 
U.S. Treasury securities and obligations of U.S. Government   $ 11,152     $ 24     $ -     $ 11,176  
Corporate bonds     93,272       2,305       (1,655 )     93,922  
Collateralized corporate bank loans     94,638       175       (1,920 )     92,893  
Municipal bonds     177,432       3,458       (2,549 )     178,341  
Mortgage-backed     4,084       80       (27 )     4,137  
                                 
Total debt securities     380,578       6,042       (6,151 )     380,469  
                                 
Financial services     11,618       4,463       (260 )     15,821  
All other     18,847       9,554       (63 )     28,338  
                                 
Total equity securities     30,465       14,017       (323 )     44,159  
                                 
Total debt and equity securities   $ 411,043     $ 20,059     $ (6,474 )   $ 424,628  
Realized Gain (Loss) on Investments [Table Text Block]

Major categories of net realized (losses) gains on investments are summarized as follows (in thousands):

 

    Three Months Ended     Six Months Ended  
    June 30     June 30  
    2012     2011     2012     2011  
                                 
U.S. Treasury securities and obligations of U.S. Government   $ -     $ -     $ -     $ 14  
Corporate bonds     (36 )     271       (150 )     271  
Collateralized corporate bank loans     135       206       136       640  
Municipal bonds     (163 )     66       (243 )     (1 )
Mortgage-backed     -       -       -       -  
Equity securities-financial services     (22 )     51       70       789  
Equity securities-all other     1,305       1,070       1,305       1,070  
Gain on investments     1,219       1,664       1,118       2,783  
Other-than-temporary impairments     (228 )     -       (246 )     -  
Net realized gains   $ 991     $ 1,664     $ 872     $ 2,783  
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Table Text Block]

The following schedules summarize the gross unrealized losses showing the length of time that investments have been continuously in an unrealized loss position as of June 30, 2012 and December 31, 2011 (in thousands):

 

    As of June 30, 2012  
    12 months or less     Longer than 12 months     Total  
          Unrealized           Unrealized           Unrealized  
    Fair Value     Losses     Fair Value     Losses     Fair Value     Losses  
                                     
U.S. Treasury securities and obligations of U.S. Government   $ 10,073     $ (5 )   $ -     $ -     $ 10,073     $ (5 )
Corporate bonds     27,175       (459 )     4,473       (734 )     31,648       (1,193 )
Collateralized corporate bank loans     55,213       (914 )     14,815       (396 )     70,028       (1,310 )
Municipal bonds     21,745       (245 )     36,689       (2,520 )     58,434       (2,765 )
Mortgage-backed     688       (10 )     106       (1 )     794       (11 )
Total debt securities     114,894       (1,633 )     56,083       (3,651 )     170,977       (5,284 )
                                                 
Financial services     90       (3 )     -       -       90       (3 )
All other     1,128       (208 )     -       -       1,128       (208 )
Total equity securities     1,218       (211 )     -       -       1,218       (211 )
                                                 
Total debt and equity securities   $ 116,112     $ (1,844 )   $ 56,083     $ (3,651 )   $ 172,195     $ (5,495 )

 

    As of December 31, 2011  
    12 months or less     Longer than 12 months     Total  
          Unrealized           Unrealized           Unrealized  
    Fair Value     Losses     Fair Value     Losses     Fair Value     Losses  
                                     
U.S. Treasury securities and obligations of U.S. Government   $ -     $ -     $ -     $ -     $ -     $ -  
Corporate bonds     21,752       (869 )     2,366       (786 )     24,118       (1,655 )
Collateralized corporate bank loans     69,717       (1,917 )     19       (3 )     69,736       (1,920 )
Municipal bonds     26,780       (196 )     39,741       (2,353 )     66,521       (2,549 )
Municipal bonds     740       (27 )     -       -       740       (27 )
Total debt securities     118,989       (3,009 )     42,126       (3,142 )     161,115       (6,151 )
                                                 
Financial services     1,789       (260 )     -       -       1,789       (260 )
All other     2,959       (63 )     -       -       2,959       (63 )
Total equity securities     4,748       (323 )     -       -       4,748       (323 )
                                                 
Total debt and equity securities   $ 123,737     $ (3,332 )   $ 42,126     $ (3,142 )   $ 165,863     $ (6,474 )
Schedule Of Amortized Cost and Estimated Fair Value Of Available For Sale Securities Contractual Maturities [Table Text Block]

The amortized cost and estimated fair value of debt securities at June 30, 2012 by contractual maturity are as follows. Expected maturities may differ from contractual maturities because certain borrowers may have the right to call or prepay obligations with or without penalties.

 

    Amortized     Fair  
    Cost     Value  
    (in thousands)  
                 
Due in one year or less   $ 48,230     $ 48,590  
Due after one year through five years     181,967       184,767  
Due after five years through ten years     111,172       110,914  
Due after ten years     52,156       51,196  
Mortgage-backed     3,527       3,602  
    $ 397,052     $ 399,069