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Fair Value Measurements - Liabilities Not Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Senior Notes | 5.75% Senior Notes due 2023    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Stated interest rate (in hundredths) 5.75%  
9% Convertible Junior Subordinated Debentures due 2063    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Stated interest rate (in hundredths) 9.00%  
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
FHLB Advance $ 155,000 $ 155,000
5.75% Notes 419,713 418,560
9% Debentures 256,872 256,872
Total financial liabilities 831,585 830,432
Fair Value | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
FHLB Advance 150,551 152,124
5.75% Notes 425,791 465,473
9% Debentures 338,069 353,507
Total financial liabilities $ 914,411 $ 971,104