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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period     $ (121,381)  
OCI $ 1,092 $ 3,026 2,613 $ 6,491
AOCI (loss), end of period (118,768)   (118,768)  
Investment securities:        
Accumulated other comprehensive income (loss), before tax        
AOCI (loss), beginning of period 6,293 9,219 3,954 3,888
OCI before reclassifications 1,746 4,885 4,386 8,388
Realized investment (gains) losses (126) (229) (548) 1,254
Impairment losses 61 0 182 345
OCI 1,681 4,656 4,020 9,987
AOCI (loss), end of period 7,974 13,875 7,974 13,875
Accumulated other comprehensive income (loss), tax        
AOCI (loss), beginning of period 2,202 3,227 1,384 1,361
OCI before reclassifications 611 1,710 1,535 2,936
Realized investment (gains) losses (44) (80) (192) 439
Impairment losses 22 0 64 121
OCI 589 1,630 1,407 3,496
AOCI (loss), end of period 2,791 4,857 2,791 4,857
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period 4,091 5,992 2,570 2,527
OCI before reclassifications 1,135 3,175 2,851 5,452
Realized investment (gains) losses (82) (149) (356) 815
Impairment losses (39) 0 (118) (224)
OCI 1,092 3,026 2,613 6,491
AOCI (loss), end of period 5,183 9,018 5,183 9,018
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 (184,402) (143,691) (186,741) (149,022)
OCI 1,681 4,656 4,020 9,987
OCI 0 0 0 0
OCI 1,681 4,656 4,020 9,987
AOCI (loss), end of period (182,721) (139,035) (182,721) (139,035)
Accumulated other comprehensive income (loss), tax        
AOCI (loss), beginning of period (64,542) (50,292) (65,360) (52,158)
OCI 589 1,630 1,407 3,496
OCI 0 0 0 0
OCI 589 1,630 1,407 3,496
AOCI (loss), end of period (63,953) (48,662) (63,953) (48,662)
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period (119,860) (93,399) (121,381) (96,864)
OCI 1,092 3,026 2,613 6,491
OCI 0 0 0 0
OCI 1,092 3,026 2,613 6,491
AOCI (loss), end of period $ (118,768) $ (90,373) $ (118,768) $ (90,373)