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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Policy acquisition costs $ 131,219 $ 115,163 $ 259,177 $ 230,207
Deferred income tax expense (480) (4,677) (2,560) (3,295)
Net income 288 1,467 18,381 21,967
Basic net income per share $ 0.01 $ 0.03 $ 0.34 $ 0.41
Diluted net income per share $ 0.01 $ 0.03 $ 0.33 $ 0.40
As Previously Reported [Member]
        
Policy acquisition costs   113,843   227,273
Deferred income tax expense   (4,215)   (2,268)
Net income   2,325   23,874
Basic net income per share   $ 0.04   $ 0.44
Diluted net income per share   $ 0.04   $ 0.43
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   1,320   2,934
Deferred income tax expense   (462)   (1,027)
Net income   $ (858)   $ (1,907)
Basic net income per share   $ (0.01)   $ (0.03)
Diluted net income per share   $ (0.01)   $ (0.03)