COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
COMPREHENSIVE INCOME (LOSS)
Net income	$ 93,364	$ 67,466	$ 41,244	$ 160,830	$ 110,950
Change in net unrealized gains (losses) on investments, net of income tax: (three months: 2011 - $85,553; 2010 - $130,774; six months: 2011 - $103,460; 2010 - $273,255)	158,888	33,263	242,856	192,151	506,815
Change in net unrealized gains (losses) on investments, income tax	85,553	17,907	130,774	103,460	273,255
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, net of income tax: (three months: 2011 - $(5,444); 2010 - $(6,960); six months: 2011 - $(9,052); 2010 - $(10,455))	(10,111)	(6,700)	(12,924)	(16,811)	(19,416)
Change in net unrealized gains (losses) relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax	(5,444)	(3,608)	(6,960)	(9,052)	(10,455)
Change in accumulated (loss) gain - derivatives, net of income tax: (three months: 2011 - $(1,777); 2010 - $(3,229); six months: 2011 - $1,844; 2010 - $(194))	(3,299)	6,724	(5,952)	3,425	(234)
Change in accumulated (loss) gain - derivatives, income tax	(1,777)	3,621	(3,229)	1,844	(194)
Change in postretirement benefits liability adjustment, net of income tax: (three months: 2011 - $(451); 2010 - $325: six months: 2011 - $(902): 2010 - $649)	(838)	(838)	603	(1,676)	1,205
Change in postretirement benefits liability adjustment, income tax	(451)	(451)	325	(902)	649
Reclassification adjustment for investment amounts included in net income, net of income tax: (three months: 2011 - $(7,271); 2010 - $3,894; six months: 2011 - $(10,325); 2010 - $5,619)	(13,508)	(5,678)	7,241	(19,186)	10,659
Reclassification adjustment for investment amounts included in net income, income tax	(7,271)	(3,054)	3,894	(10,325)	5,619
Reclassification adjustment for derivative amounts included in net income, net of income tax: (three months: 2011 - $238; 2010 - $768; six months: 2011 - $(123); 2010 - $(206))	443	(671)	1,382	(228)	(370)
Reclassification adjustment for derivative amounts included in net income, income tax	238	(361)	768	(123)	(206)
Comprehensive income for the period	224,939	93,566	274,450	318,505	609,609
Comprehensive income (loss) attributable to noncontrolling interests	(296)		127	(245)	200
Comprehensive income (loss) attributable to Protective Life Corporation	$ 224,643		$ 274,577	$ 318,260	$ 609,809

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