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Indebtedness (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2006
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Sep. 25, 2006
Dec. 31, 2011
Seven Point Twenty Five Percent Senior Notes [Member]
Nov. 15, 2004
Seven Point Twenty Five Percent Senior Notes [Member]
Dec. 31, 2005
Six Point Seventy Percent Senior Notes [Member]
Dec. 31, 2011
Six Point Seventy Percent Senior Notes [Member]
Nov. 03, 2005
Six Point Seventy Percent Senior Notes [Member]
Dec. 31, 2011
Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
Dec. 31, 2009
Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
Dec. 31, 2011
One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
Aggregate principal amount of notes         $ 100,000,000   $ 50,000,000     $ 100,000,000      
Discount for notes issued             100,000     700,000      
Effective yield             7.27%     6.754%      
Bond proceeds to Insurance Subsidiaries as capital             25,000,000            
Acceleration of principal   10,000,000       10,000,000     10,000,000        
Net proceeds from the issuance 96,800,000             50,000,000          
Deferred interest payments         10                
Aggregate investment in FHLBI   2,900,000   800,000                  
Borrowing threshold of FHLBI   20                      
FLHBI Borrowing   58,000,000 13,000,000                 13,000,000 45,000,000
Unpaid principal amount interest rate                     2.90%   1.25%
Line of credit borrowing capacity   30,000,000                      
Line of credit, maximum borrowing capacity   $ 50,000,000                      
Maximum FHLBI borrowing percentage permitted by line of credit   10.00%