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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Accumulated Other Comprehensive (Loss) Income (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax $ 2,938 $ 14,721 $ (6,293)
Other comprehensive income before reclassifications (31,199) (2,322) 42,702
Reclassified from accumulated other comprehensive income 5,686 15,806 10,373
Income tax (expense) benefit 12,910 6,345 (11,315)
Other comprehensive (loss) income, net of tax (23,975) (11,783) 21,014
Ending balance, net of tax (21,037) 2,938 14,721
Net other unrealized investment gain (loss)
     
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax 30,500 37,271 11,010
Other comprehensive income before reclassifications (50,810) 7,549 52,196
Reclassified from accumulated other comprehensive income 9,431 17,966 11,795
Income tax (expense) benefit 21,085 3,646 (14,140)
Other comprehensive (loss) income, net of tax (39,156) (6,771) 26,261
Ending balance, net of tax (8,656) 30,500 37,271
Other-than-Temporary Impairment
     
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax (1,140) (1,577) (1,778)
Other comprehensive income before reclassifications 753 491 310
Reclassified from accumulated other comprehensive income (1,001) (181) 0
Income tax (expense) benefit (614) (235) (109)
Other comprehensive (loss) income, net of tax 1,140 437 201
Ending balance, net of tax 0 (1,140) (1,577)
Net Prior Service Cost (Credit)
     
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax 248 276 305
Other comprehensive income before reclassifications (357) 0 0
Reclassified from accumulated other comprehensive income 43 43 44
Income tax (expense) benefit 140 15 15
Other comprehensive (loss) income, net of tax (260) (28) (29)
Ending balance, net of tax (12) 248 276
Net Unamortized Gain (Loss)
     
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax (26,670) (21,249) (15,830)
Other comprehensive income before reclassifications 19,215 (10,362) (9,804)
Reclassified from accumulated other comprehensive income (2,787) (2,022) (1,466)
Income tax (expense) benefit (7,701) 2,919 2,919
Other comprehensive (loss) income, net of tax 14,301 (5,421) (5,419)
Ending balance, net of tax $ (12,369) $ (26,670) $ (21,249)