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Statutory Information and Restrictions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliations of statutory capital and surplus                              
Statutory capital and surplus of insurance subsidiaries $ 754,153       $ 711,983               $ 754,153 $ 711,983  
Increase (decrease) due to:                              
Deferred policy acquisition costs 196,885       216,456               196,885 216,456  
Difference in policyholder reserves 67,582       58,517               67,582 58,517  
Goodwill 47,396       47,396               47,396 47,396  
Liability for postretirement benefits other than pensions (2,862)       (3,326)               (2,862) (3,326)  
Investment fair value adjustments on fixed maturities 651,071       439,944               651,071 439,944  
Difference in investment reserves 101,276       84,519               101,276 84,519  
Federal income tax liability (317,875)       (247,019)               (317,875) (247,019)  
Net funded status of pension and other postretirement benefit obligations (23,862)       (25,137)               (23,862) (25,137)  
Non-admitted assets and other, net 10,660       10,831               10,660 10,831  
Shareholders' equity (deficit) of parent company and non-insurance subsidiaries (812)       (1,067)               (812) (1,067)  
Parent company short-term and long-term debt (237,809)       (237,744)               (237,809) (237,744)  
Total shareholders' equity 1,245,803       1,055,353       847,087       1,245,803 1,055,353 847,087
Reconciliations of statutory net income                              
Statutory net income of insurance subsidiaries                         93,299 63,986 77,235
Net loss of non-insurance companies                         (4,726) (10,164) (4,211)
Interest expense                         (14,249) (14,007) (13,953)
Tax benefit of interest expense and other parent company current tax adjustments                         9,308 4,603 5,411
Combined net income                         83,632 44,418 64,482
Increase (decrease) due to:                              
Deferred policy acquisition costs                         16,595 8,989 11,557
Policyholder benefits                         15,574 14,428 13,024
Federal income tax expense                         (19,843) (6,639) (17,595)
Investment reserves                         14,021 9,903 16,167
Other adjustments, net                         (6,113) (593) (7,504)
Net income $ 31,826 $ 32,266 $ 13,103 $ 26,671 $ 32,913 $ 23,637 $ (11,851) $ 25,807 $ 14,592 $ 19,886 $ 23,381 $ 22,272 $ 103,866 $ 70,506 $ 80,131