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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period     $ (121,381)  
OCI (loss) $ (167) $ 355 2,446 $ 6,846
AOCI (loss), end of period (118,935)   (118,935)  
Investment securities:        
Accumulated other comprehensive income (loss), before tax        
AOCI (loss), beginning of period 7,974 13,875 3,954 3,888
OCI before reclassifications 643 1,121 5,029 9,509
Realized investment (gains) losses (899) (576) (1,447) 678
Impairment losses     182 345
OCI (loss) (256) 545 3,764 10,532
AOCI (loss), end of period 7,718 14,420 7,718 14,420
Accumulated other comprehensive income (loss), tax        
AOCI (loss), beginning of period 2,791 4,857 1,384 1,361
OCI before reclassifications 225 392 1,760 3,328
Realized investment (gains) losses (314) (202) (506) 237
Impairment losses     64 121
OCI (loss) (89) 190 1,318 3,686
AOCI (loss), end of period 2,702 5,047 2,702 5,047
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period 5,183 9,018 2,570 2,527
OCI before reclassifications 418 729 3,269 6,181
Realized investment (gains) losses (585) (374) (941) 441
Impairment losses     118 224
OCI (loss) (167) 355 2,446 6,846
AOCI (loss), end of period 5,016 9,373 5,016 9,373
Pension and other postretirement plans:        
Accumulated other comprehensive income (loss), before tax        
AOCI (loss), beginning of period (190,695) (152,910) (190,695) (152,910)
AOCI (loss), end of period (190,695) (152,910) (190,695) (152,910)
Accumulated other comprehensive income (loss), tax        
AOCI (loss), beginning of period (66,744) (53,519) (66,744) (53,519)
AOCI (loss), end of period (66,744) (53,519) (66,744) (53,519)
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period (123,951) (99,391) (123,951) (99,391)
AOCI (loss), end of period (123,951) (99,391) (123,951) (99,391)
Total        
Accumulated other comprehensive income (loss), before tax        
AOCI (loss), beginning of period (182,721) (139,035) (186,741) (149,022)
OCI (loss) (256) 545 3,764 10,532
OCI (loss) 0 0 0 0
OCI (loss) (256) 545 3,764 10,532
AOCI (loss), end of period (182,977) (138,490) (182,977) (138,490)
Accumulated other comprehensive income (loss), tax        
AOCI (loss), beginning of period (63,953) (48,662) (65,360) (52,158)
OCI (loss) (89) 190 1,318 3,686
OCI (loss) 0 0 0 0
OCI (loss) (89) 190 1,318 3,686
AOCI (loss), end of period (64,042) (48,472) (64,042) (48,472)
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period (118,768) (90,373) (121,381) (96,864)
OCI (loss) (167) 355 2,446 6,846
OCI (loss) 0 0 0 0
OCI (loss) (167) 355 2,446 6,846
AOCI (loss), end of period $ (118,935) $ (90,018) $ (118,935) $ (90,018)