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Indebtedness - Long-term Debt Activity - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2016
Nov. 30, 2005
Nov. 30, 2004
Debt Instrument [Line Items]              
Maximum borrowing percentage   10.00%          
Debt issuance costs $ 3,300            
Proceeds from borrowings   $ 0 $ 20,000 $ 60,000      
Borrowing threshold of FHLBI   20          
Federal Home Loan Bank of Indianapolis              
Debt Instrument [Line Items]              
Aggregate investment in FHLBI   $ 5,200 $ 5,200        
Line of Credit              
Debt Instrument [Line Items]              
Acceleration of principal   $ 30,000          
Maximum borrowing percentage   10.00%          
5.375% Senior Notes              
Debt Instrument [Line Items]              
Original debt issued $ 300,000 $ 300,000          
Interest rate (as a percent) 5.375% 5.375% 5.375%        
Discount for notes issued $ 5,900            
Proceeds from borrowings $ 290,800            
3.03% Borrowings from FHLBI              
Debt Instrument [Line Items]              
Original debt issued   $ 60,000     $ 60,000    
Interest rate (as a percent)   3.03% 3.03%   3.03%    
6.70% Senior Notes              
Debt Instrument [Line Items]              
Acceleration of principal           $ 10,000  
Original debt issued   $ 100,000       $ 100,000  
Interest rate (as a percent)   6.70% 6.70%     6.70%  
Discount for notes issued           $ 700  
Effective yield (as a percent)           6.754%  
7.25% Senior Notes              
Debt Instrument [Line Items]              
Acceleration of principal             $ 10,000
Original debt issued   $ 50,000         $ 50,000
Interest rate (as a percent)   7.25% 7.25%       7.25%
Discount for notes issued             $ 100
Effective yield (as a percent)             7.27%