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Adoption of Accounting Pronouncements (Income Statement Statement) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Policy acquisition costs $ 131,849 $ 116,111 $ 391,026 $ 346,318
Deferred income tax expense (benefit) 7,128 (164) 4,568 (3,459)
Net income (loss) 18,274 (17,968) 36,655 3,999
Basic net income (loss) per share $ 0.33 $ (0.33) $ 0.67 $ 0.07
Diluted net income (loss) per share $ 0.33 $ (0.33) $ 0.66 $ 0.07
As Previously Reported [Member]
        
Policy acquisition costs   119,456   346,729
Deferred income tax expense (benefit)   (1,335)   (3,603)
Net income (loss)   (20,142)   3,732
Basic net income (loss) per share   $ (0.37)   $ 0.07
Diluted net income (loss) per share   $ (0.37)   $ 0.07
Add: Adjustment for the cumulative effect on prior years of applying retroactively the new method of accounting for deferred policy acquisition costs [Member]
        
Policy acquisition costs   (3,345)   (411)
Deferred income tax expense (benefit)   1,171   144
Net income (loss)   $ 2,174   $ 267
Basic net income (loss) per share   $ 0.04   $ 0.00
Diluted net income (loss) per share   $ 0.04   $ 0.00