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Valuation of Business Acquired (Tables)
12 Months Ended
Dec. 31, 2012
PresentValueOfFutureInsuranceProfitsAbstract  
VOBA and Gross Amortization Table
   2012  2011  2010
 (in thousands)
Balance, beginning of period $ 29,010 $ 32,497 $ 52,596
Amortization - Impact of assumption and experience unlocking and true-ups (1)   21,931   (1,489)   (1,494)
Amortization - All other (1)   (13,871)   (15,967)   (10,295)
Interest (2)   2,077   2,288   2,965
Change in unrealized gains/losses   3,943   11,681   (11,275)
Balance, end of year $ 43,090 $ 29,010 $ 32,497

(1) The weighted average remaining expected life of VOBA was approximately 5.06 years from the date of acquisition.

(2) The interest accrual rate for the VOBA related to the businesses acquired was 6.18%, 4.81% and 4.97% for years ended December 31, 2012, 2011 and 2010.

Future Amortization Table
  2013 2014 2015 2016 2017
 (in thousands)
Estimated future VOBA amortization$ 7,544$ 6,012$ 4,930$ 4,051$ 3,487