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Indebtedness (Narrative) (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2005
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2004
USD ($)
Short Term Debt Gross   $ 60,000      
Aggregate investment in FHLBI   $ 2,800 $ 2,800    
Borrowing threshold of FHLBI   20      
Five Point Eight Hundred Seventy Five Percent Senior Notes Due 2043 [Member]          
Aggregate principal amount of notes       $ 185,000  
Bond proceeds to Insurance Subsidiaries as capital       57,100  
Long-term Debt, Gross   $ 185,000      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   5.88%      
Redemption Of Seven Point Fifty Percent Junior Notes [Member]          
Aggregate principal amount of notes       $ 100,000  
Six Point Seventy Percent Senior Notes due 2035 [Member]          
Aggregate principal amount of notes $ 100,000        
Discount for notes issued $ 700        
Effective yield 6.754%        
Acceleration of principal   $ 10,000      
Net proceeds from the issuance $ 50,000        
Long-term Debt, Gross   $ 100,000      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   6.70%      
Seven Point Twenty Five Percent Senior Notes due 2034 [Member]          
Aggregate principal amount of notes         $ 50,000
Discount for notes issued         $ 100
Effective yield         7.27%
Bond proceeds to Insurance Subsidiaries as capital         $ 25,000
Acceleration of principal   $ 10,000      
Long-term Debt, Gross   $ 50,000      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   7.25%      
Line of Credit expires Dec.1, 2020 [Member]          
Acceleration of principal   $ 20,000      
Line of credit borrowing capacity   30,000      
Line of credit, maximum borrowing capacity   50,000      
One Point Sixty One Percent Borrowing From Federal Home Loan Bank Due July 21, 2021 [Member]          
Long-term Debt, Gross   $ 25,000      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   1.61%      
One Point Fifty Six Percent Borrowing From Federal Home Loan Bank Due August 16, 2021 [Member]          
Long-term Debt, Gross   $ 25,000      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   1.56%      
Zero Point Sixty Three Percent Borrowing From Federal Home Loan Bank Due July 22, 2016 [Member]          
Short Term Debt Gross   $ 15,000      
Short-term Debt, Percentage Bearing Fixed Interest Rate   0.63%      
One Point Twenty Five Percent Borrowing From Federal Home Loan Bank due Dec. 16, 2016 [Member]          
Short Term Debt Gross   $ 45,000      
Short-term Debt, Percentage Bearing Fixed Interest Rate   1.25%