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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
Mar. 31, 2012
Mar. 31, 2011
Policy acquisition costs $ 127,958 $ 115,044
Deferred income tax expense (2,080) 1,382
Net income 18,093 20,500
Basic net income per share $ 0.33 $ 0.38
Diluted net income per share $ 0.33 $ 0.37
As Previously Reported [Member]
    
Policy acquisition costs   113,430
Deferred income tax expense   1,947
Net income   21,549
Basic net income per share   $ 0.40
Diluted net income per share   $ 0.39
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   1,614
Deferred income tax expense   (565)
Net income   $ (1,049)
Basic net income per share   $ (0.02)
Diluted net income per share   $ (0.02)