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Deferred Policy Acquisition Costs (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance, beginning of year $ 171,430 $ 170,579 $ 175,866
Policy acquisition costs deferred 492,268 482,572 500,278
Amortization (477,788) (481,721) (505,565)
Balance, end of year $ 185,910 $ 171,430 $ 170,579